By: Artun Duzay · Updated:
Pattern from measurements: drafting a basic block, from the tape measure to the toile
Drafting a pattern from measurements turns body measurements into a basic block on paper, with ease, darts and seam allowance. This guide covers measuring well, drafting and grading a base size and testing it with a toile; then what Stiloir's Pattern from measurements does.
What does drafting a pattern from measurements mean?
A pattern is a garment's pieces on paper, ready to be cut from cloth. Drafting a pattern from measurements means drawing those pieces from a few body measurements, with a ruler and formulas. There are three ways to a pattern, and most studios use all three:
| Way | How it works | When it helps |
|---|---|---|
| Drafting from measurements | Measurements go onto paper by a drafting system; lines, curves and darts come from formulas. | A new block, a size range, made-to-measure |
| Draping on a dress form | Cloth is pinned and shaped on the form, then traced onto paper. | Fluid, asymmetric or sculptural designs |
| Copying an existing garment | The pieces of a garment of yours that fits well are traced onto paper. | Getting a fit you love again |
The first thing a draft gives you is a basic block, also called a sloper: a plain pattern with no collar, pocket or closure that simply fits the body. You build the design on top of it: move darts, add ease, change the collar and the sleeve. The better the block fits, the fewer corrections the designs made from it need.
Drafting systems are taught in books and schools. Winifred Aldrich's Metric Pattern Cutting for Women's Wear and the German Müller & Sohn system are two well-known ones. They differ in the details, but all of them start from the same basic measurements.
Which measurements do you need to draft a pattern?
The measurements depend on the garment. The table below lists the ones basic blocks use most; all are taken in centimetres.
| Measurement | Where to take it | For which pattern |
|---|---|---|
| Bust | At the fullest point, level across the back | Top, dress |
| Waist | At the natural waist, the narrowest part of the torso | All |
| Hip | At the widest part of the hips, level with the floor | All |
| Back length | From the neck bone that stands out when you bend your head, down to the natural waist | Top, dress |
| Shoulder width | Across the back, from one shoulder point to the other | Top, dress |
| Upper arm | Around the fullest part of the arm, relaxed | Tops and dresses with sleeves |
| Sleeve length | From the shoulder point over a slightly bent elbow to the wrist or the sleeve hem you want | Tops and dresses with sleeves |
| Crotch depth | Seated on a hard chair, at the side from the waist to the seat | Trousers |
| Inseam | Crotch to hem, often taken from trousers that fit well | Trousers |
| Length | From the waist to the hem you want | Skirt, dress |
Don't mix up two kinds of measurement. A body measurement is the body itself; a garment measurement is the finished garment. The difference between them is ease. Bust, waist and hip always come from the body. Some, like the inseam or the width of a trouser hem, are easier to take from a garment you like.
In the end, measurements and sizes go into the tech pack's measurement table. The tech pack guide shows how to build one.
How do you take body measurements accurately?
A pattern is only as good as its measurements. A small measuring error comes back as a big correction at the fitting. When you measure:
- Measure over thin, close-fitting clothes or the underwear you will wear under the garment, never over a thick sweater.
- Tie a narrow elastic or ribbon round the waist. The natural waistline shows itself, and you take the lengths from that line.
- Keep the tape snug but not tight. For girths, keep it level with the floor all the way round; check the back in a mirror or with a helper.
- Stand straight but relaxed, breathe normally and don't hold your stomach in.
- Ask someone to take back measurements like back length and shoulder width. Back measurements taken alone are often wrong.
- Take each measurement twice and write them down with the date; bodies change over time.
- If you draft for a size rather than a person, take the measurements from your own size chart and keep every pattern to that chart.
What is ease, and how much should you add to a pattern?
Ease is the difference between a garment measurement and a body measurement. A woven garment drafted to the exact body measurement can't be worn: you can't sit, you can't raise your arms, and the cloth strains as you breathe. Ease comes in two parts:
- Wearing ease. The least you need to move in comfort. Even a close-fitting pattern has it.
- Design ease. Extra room for the look: the added width of a relaxed or oversized piece.
There is no single ease value for everything. Choose it by looking at:
- The fabric: woven cloth doesn't stretch and needs ease. A stretch knit may need very little; in a very stretchy knit the garment can even be drafted smaller than the body.
- The garment: a jacket or coat worn over other clothes needs more ease than a blouse worn under them.
- Where on the body: the waist usually takes less ease than the bust and hip.
- The fit you want: slim, regular, relaxed or wide.
The safest way is to measure. Lay a garment you like, in a similar fabric, flat. Measure its width at bust, waist and hip, double it and subtract your body measurement: what is left is that garment's ease. If you follow a drafting system, first check whether the system already adds ease; adding it twice is a common mistake.
In Stiloir
In Pattern from measurements you enter body measurements and the formula adds the ease. How much depends on the Fit choice: Slim, Regular, Relaxed or Wide. Once the pattern is drafted, the 3D check shows how many centimetres of ease it leaves at the waist and hip (and at the bust for a top or dress).
The basic block, darts and princess seams
Cloth is flat; the body isn't. A dart is a triangular seam that takes out excess cloth so a flat piece follows the curves of the bust, waist, hip and shoulder blade. In a basic block, darts usually sit here:
- A bust dart on the front: it points towards the bust point but stops a little short of it.
- Waist darts on the front and back: they take up the difference between bust or shoulder blade and waist.
- A back shoulder or back neck dart: for the curve of the shoulder blade.
- Waist darts on skirts and trousers: they take up the difference between waist and hip.
A dart can move; the amount it takes can't. A bust dart can be moved to the armhole, the shoulder or the neckline: the fit stays the same and only the look changes. A princess seam is a moved dart too: what the bust and waist darts take up becomes a long seam running down from the shoulder or the armhole. Pleats, gathers or a panelled skirt can do the same job as a dart.
Every piece of a finished pattern carries these marks: the sewing line, the cut line, notches where pieces meet, a grain line that lies parallel to the selvedge, dart points, and the piece's name, size and how many to cut.
Seam allowance: included, or a net pattern?
Seam allowance is the strip between the sewing line and the cut line. A pattern comes one of two ways:
| Pattern | What it means | Why use it |
|---|---|---|
| With seam allowance | The allowance is part of the pattern; you cut on the cut line. | Quick to cut; production cutting patterns usually include it. |
| Net pattern | The pattern ends at the sewing line; you add the allowance as you cut the cloth. | The sewing line is visible; changes after a fitting are easy. |
Allowance isn't one number. Home-sewing patterns often use 1.5 cm; ready-to-wear often uses 1 cm, and less for overlocked seams. Hems take a wider allowance. Curved edges like a neckline take a narrower one, so the cloth doesn't bunch in the curve. Decide by fabric, seam type and how the edges are finished, and write it on the pattern.
In Stiloir
In Pattern from measurements you pick the Seam allowance: With allowance · 1 cm, hems 4 cm, or Without · net pattern. An unpleated flared skirt's hem takes 1.5 cm. On the board the cut line is solid and the sewing line dashed.
Base size and grading: taking a pattern to other sizes
If you make more than one size, you don't draft each one separately. You draft, fit and correct one size first: the base size, or sample size. The other sizes are made larger and smaller from that pattern; this is called grading.
Set up your size chart
Put bust, waist, hip and length measurements for each size in one table. The differences between sizes become your grading rules.
Draft and fit the base size
Draft a size from the middle of your range, test it with a toile and correct it. Don't grade before the base size fits, or the same fault moves into every size.
Spread the differences over the pattern's points
The size difference of a girth is shared between the front and back pieces and the side seam. Lengths usually change less than girths.
Draw the sizes nested and check them
Draw the sizes inside each other from a common point. The spacing between the lines should be even; where it opens and closes, a measurement has been graded wrong.
Size steps vary by brand, market and size range, and they often grow in larger sizes. A size far from the base may deserve its own draft from its own measurements rather than more grading.
The toile: test the pattern before you cut the real fabric
No pattern fits perfectly at the first draft. A toile (a muslin, in American English) is the pattern sewn in cheap cloth and tried on. Calico is the usual choice; a cloth close to the real fabric's weight and drape gives a truer result. A pattern drafted for a stretch fabric is tested in a knit of similar stretch. Wear the toile and check:
- Do the side seams hang straight down, or swing to the front or back?
- Is the hem the same height from the floor all round?
- Are there drag lines? Drag lines point to where the problem is.
- Are the dart points in the right place, or do they leave a pointed bubble?
- Does the shoulder seam sit on top of the shoulder? Does the armhole pinch?
- Sit, walk, raise your arms: does the crotch pull, does the back strain?
Mark corrections on the toile with pins and a pen, then carry them over to the pattern. For every seam you change, check the piece it joins: both edges must be the same length and the notches must match. After a big change, sew a second toile.
Common mistakes when drafting from measurements
- Measuring over thick clothes, or pulling the tape tight.
- Mixing up body and garment measurements.
- Forgetting ease, or adding it again when the drafting system already has.
- Forgetting seam allowance, or adding it in the cloth to a pattern that already includes it.
- Not comparing seams that join: the front and back side seams must be the same length.
- Leaving notches, grain line and piece names off the pattern.
- Grading before the base size fits.
- Cutting the real fabric without a toile.
- Printing a true-size PDF pattern with “fit to page”. The scale must be 100%; measure the pattern's check square with a ruler.
Pattern from measurements in Stiloir, step by step
Stiloir is a fashion research and design app for the web, iPhone and iPad. Its Pattern from measurements tool works on a web board: it starts from a garment image on the board and drafts a basic block for trousers, a skirt, a dress or a top with your measurements. AI only reads the cut; the lines, darts and ease are drawn by formula.
Select the garment image
On a web board, select a photo, a technical flat or a sketch of the garment. Press AI / Transform in the bottom bar, or right-click, and choose Pattern from measurements. If the image shows more than one garment, the panel asks Which garment?; pick the one the pattern is for.
Check the cut that was read
The cut read from the image appears as short labels: the garment, the fit, the sleeve, the neckline, princess seams, a corset, hip flaps or skirt panels, for example. If something was read wrong, press Correct and change it. If the image shows no trousers, skirt, dress or top, you choose the garment and cut yourself.
Pick the base size and enter your measurements
Pick a size under Base size; the panel offers EU sizes 34 to 46. The measurements fill in from that size's standard table; correct them with your own under Measurements (cm). For trousers, the inseam, hem, knee and thigh are the trousers' own measurements; waist, hip and crotch depth come from the body.
Choose other sizes and the seam allowance
Tap the sizes to grade under Pattern sizes. They are graded up and down from the base, bust, waist and hip change 4 cm per size, and all of them are drawn nested in the pattern. Under Seam allowance, choose with allowance or a net pattern.
Draft the pattern
The Draft the pattern button says how many credits it will use, and an in-app confirmation opens before any credits are taken. If the selection is a photo, its technical flat is drawn and added to the board first, and the pattern lands beside it. If you selected a technical flat or a sketch, nothing new is drawn. The photo to flat sketch guide explains how the flat is made.
Credits in Stiloir
Pattern from measurements uses credits; the Draft the pattern button and the confirmation say how many. If the selection is a photo, its technical flat adds one Standard image, 4 credits. Drafting the same image again within a short window, revising the same cut with new measurements, the 3D check and downloading the pattern files are free. Plans' monthly credits are on the Plans page.
The pattern on the board: table, revisions, 3D check and files
The pattern lands on the board as editable lines. Each piece carries its name, its sizes and how many to cut; notches, darts and grain line arrows are marked. The base size is drawn dark, the other sizes light grey. A small measurement table sits beside the pattern, the base size's column shaded. The panel shows the same table with each piece's cut size (width × height) and the notions to buy, such as an invisible zip or eyelets.
| Task | How | Credits |
|---|---|---|
| Revise from the table | Change a number in the measurement table on the board; Revise with these measurements appears at the pattern's corner. The pattern is redrawn in the same place at the same scale. A number in the base size changes the whole pattern; a number in another size changes only that size. | Free |
| Edit the pattern | Right-click the pattern and choose Edit the pattern; change the measurements, the sizes or the seam allowance. Changing the garment or the cut makes it a new pattern. | Free for the same cut |
| 3D check | The pattern is sewn on an unseen mannequin and shown from four sides: do the seams meet, does the cloth strain, how much ease is there, is the hem level. The picture is added beside the pattern. | Free |
| Files | Download DXF (AAMA), DXF (ASTM) or PDF 1:1 from the panel or from Export in the right-click menu. | Free |
The DXF files use the exchange formats of fashion pattern CAD (AAMA and ASTM); if your program won't open one, try the other. The PDF 1:1 is a single page at true size, not split into A4 sheets, so it needs a wide-format printer or plotter. Print at 100% and measure the 10 cm check square with a ruler.
The limits of Stiloir's pattern
- It is a basic block. Have a patternmaker check it and sew a toile before production; the panel says so too.
- There are four kinds: trousers, skirt, dress and top. There is no separate block for a jacket or coat; those start from the top block.
- AI only reads the cut, and it can read it wrong. It takes no measurements from the image; at most it suggests a skirt's rough length. Always check the cut it read.
- The 3D check sews the basic block without collars, belts or trims. It is a quick check, not a stand-in for a toile.
- Pattern from measurements is on the web board only for now; the iPhone and iPad app doesn't have it.
A pattern alone isn't enough for production: drawings, the measurement table and the materials list come together in a tech pack. See the tech pack guide for that, or browse all guides.
Frequently asked
What measurements do I need to draft a sewing pattern?
For a top or dress: bust, waist, hip, back length, shoulder width and upper arm, plus sleeve length for a sleeved design. For a skirt, waist, hip and skirt length are enough. For trousers, waist, hip, crotch depth and inseam are the basics; you set the hem width to suit the design. Bust, waist and hip always come from the body, with the tape snug and level with the floor.
How much ease should I add to a pattern?
There is no single value: ease depends on the fabric, the garment, the part of the body and the fit you want. Woven cloth needs more than a stretch knit, a jacket worn over clothes more than a blouse worn under them, and the waist usually less than the bust and hip. The safest way is to measure a garment you like and compare it with your body measurements. In Stiloir's Pattern from measurements, the Fit choice (Slim, Regular, Relaxed or Wide) sets the ease.
What is a net pattern, and should a pattern include seam allowance?
A net pattern ends at the sewing line, and you add the allowance as you cut the cloth. A pattern with allowance includes it, and you cut on the cut line. Home-sewing patterns often use 1.5 cm and ready-to-wear often 1 cm, with wider hems. Whichever you use, write it on the pattern so the allowance isn't added twice.
What is the difference between a block, a sloper and a pattern?
A block and a sloper are the same thing: a plain pattern that only fits the body, with no collar, pocket or closure. A design pattern is built on top of it by moving darts and adding ease and new pieces. A block that fits well means every design made from it needs fewer corrections.
How do I grade a pattern to other sizes?
Draft the base size and fit it with a toile first; then spread the differences from your size chart over the pattern's points and draw the sizes nested. Size steps vary by brand and size range. In Stiloir, the sizes you pick under Pattern sizes are graded from the base size, with bust, waist and hip changing 4 cm per size.
Can Stiloir draft a sewing pattern from my measurements?
Yes, with Pattern from measurements on a web board: AI reads the cut from the garment image you select, a formula draws the lines with your measurements, and the pattern lands on the board with a measurement table; you download it as DXF (AAMA, ASTM) or PDF 1:1. It drafts basic blocks for trousers, skirts, dresses and tops, and a patternmaker's check and a toile are needed before production. The Draft the pattern button shows the credits it uses; plans' credits are on the Plans page.