Sewing for a plus-size body works best when the pattern starts from your measurements rather than from a small base size graded up. Grading stretches a pattern drafted for a narrower frame, so shoulders often end up too wide, armholes too deep and bust darts too small, while the upper arm, tummy and seat are too tight. Measure carefully (full bust, high bust, upper arm, waist, hip and the lengths), add the ease the garment needs in centimeters rather than as a percentage, and test fitted designs with a toile.
Plus size covers very different bodies: an apple shape, a pear shape, a full bust on a narrow frame, broad shoulders, a long or short torso. None of them is a problem to correct. They are the measurements the pattern should follow.
Why do graded patterns often fit plus-size bodies badly?
Most commercial patterns, like most ready-to-wear, are drafted in one base size near the middle of the range and graded outward. The further a size is from the base, the more the grading rules drift from real bodies:
- Shoulders and neckline grow with the bust, so a size chosen by full bust can slide off narrower shoulders and gape at the neck.
- Bust darts barely change, though a fuller bust needs more shaping. The result is drag lines pointing at the bust and a front hem that rides up.
- Upper arms grow too little. A set-in sleeve that fits the armhole can still be tight around the bicep.
- Front lengths stay the same, though a fuller bust or tummy needs more length at the front than at the back.
- Steps get bigger. Many charts move to larger steps in the upper sizes, as Sewly's own chart does with 6 cm (2 3/8 in) steps above EU 44, so the gap between two sizes widens where blending matters most.
Which measurements matter most?
All the usual ones, plus a few that make the difference:
| Measurement | Why it matters |
|---|---|
| Full bust and high bust | Their difference shows how much bust shaping you need |
| Underbust | Sizes the bust dart together with the full bust |
| Upper arm | Decides whether a sleeve fits; often the first thing that does not |
| Waist and tummy | A fuller tummy needs length as well as width at center front |
| Hip and seat | The fullest part can sit lower than on standard charts |
| Back and front waist length | Front length grows with bust and tummy, so measure both |
| Thigh and crotch depth | Trousers that fit the waist can still pull at the thigh |
Take each measurement twice and keep the tape level, using a mirror. Our guide on taking body measurements shows where each one goes, and measuring yourself alone has tricks for the awkward ones.
How much ease do plus-size garments need?
About the same number of centimeters as on any body. Ease is room to move and breathe, and it does not scale with size: a woven bodice with 10 cm (4 in) of bust ease feels similar on an 88 cm bust and on a 128 cm bust. Patterns that add ease as a percentage of the measurement end up tent-like in the larger sizes.
As a rough guide, measured around the whole body:
| Fit | Woven bust | Woven hip | Knit bust |
|---|---|---|---|
| Fitted | 5 to 8 cm (2 to 3 in) | 4 to 6 cm (1 1/2 to 2 3/8 in) | -5 to 0 cm (negative to zero) |
| Regular | 8 to 12 cm (3 to 4 3/4 in) | 6 to 10 cm (2 3/8 to 4 in) | 3 to 8 cm (1 1/4 to 3 in) |
| Relaxed | 14 to 20 cm (5 1/2 to 8 in) | 10 to 15 cm (4 to 6 in) | 10 to 15 cm (4 to 6 in) |
Check the upper arm separately: a woven sleeve needs roughly 5 to 7 cm (2 to 2 3/4 in) more than your upper arm measurement to move comfortably. See ease for the full explanation.
Do I need a full bust adjustment?
With patterns sized by full bust, often yes. The usual rule is that if your full bust is more than about 5 cm (2 in) larger than your high bust, the pattern's bust shaping is too small for you: you choose the size by high bust, so the shoulders and neckline fit, then add width and length over the bust. Our post on the full bust adjustment explains how, and when you can skip it.
When a pattern is drafted from your measurements, the shaping comes from your numbers instead. In Sewly, the side bust dart of a woven bodice is sized from the difference between your bust and underbust, and the bust point is placed from your bust height and bust span.
What should I sew first?
Start with garments that need fewer fit decisions and build from there:
- Pull-on trousers or shorts in linen or viscose twill: an elastic waist, in-seam pockets and a length you choose. A wider elastic, 3 to 4 cm (1 1/4 to 1 1/2 in), sits flatter and rolls less. Bermuda-length shorts help against thigh chafing.
- A knit T-shirt in cotton jersey with some elastane: the stretch absorbs small differences.
- A gathered or wrap skirt: a wrap adjusts at the waist every time you wear it.
- A woven top or shift dress with bust darts, once your measurements are confirmed with a toile.
- A fit-and-flare dress, where the bodice fit is everything: always worth a toile.
The pull-on trousers pattern is a good first piece to check your lower-body measurements.
Which construction tips help in larger sizes?
- Keep 1.5 cm (5/8 in) seam allowances at the side seams of a first version, so there is room to let out after the toile.
- Choose a long enough zip. A back zip that ends well above the widest part of the hip makes a dress hard to step into; 55 to 60 cm (22 to 24 in) suits most shift dresses.
- Interface pocket openings and facings lightly, so they do not stretch with wear.
- Choose the fabric for the silhouette you want. Fluid viscose and crepe drape close; crisp cotton and linen hold a shape away from the body.
- Finish seams well. Larger panels put more weight on the seams, so a 2.5 mm stitch and a good seam finish keep them flat after many washes.
Can I get patterns in my size without adjusting them?
Sewly's standard women's sizes run from EU 32 to 54 (US 0 to 22, UK 4 to 26), and its made-to-measure drafting starts from your own numbers rather than the nearest size, so you do not have to begin at the end of a chart and grade up. You can compare the finished garment measurements with your body, see the garment on a 3D mannequin built from your measurements, and change the fit or a length by hand as often as you like. Read more about custom-fit sewing patterns.