Negative ease is when a finished garment measures less than the body it is for, so the knit stretches to fit instead of hanging with room to spare. In practice a fitted T-shirt in a jersey with 50 % stretch is drafted 2 to 5 cm (3/4 to 2 in) smaller than the bust, a rib-knit tank 5 to 10 % smaller, and leggings 10 to 20 % smaller than the hip. The rule that keeps it comfortable: use no more negative ease than about half the fabric's stretch percentage, and none at all where strained fabric would show.
What is negative ease, and how is it different from ease in wovens?
Ease is the difference between the garment and the body. Woven fabric does not stretch, so every woven garment needs positive ease: a shirt is at least 6 to 10 cm (2 1/4 to 4 in) bigger than the chest so that you can breathe and move. Knits stretch, so the ease can go to zero or below zero. Negative ease is the amount by which the garment is smaller than the body; the fabric makes up the difference by stretching, and its recovery is what holds the garment against you.
Negative ease is not the same as a tight fit. A fitted tee with 3 cm of negative ease in a soft jersey feels like a second skin; the same 3 cm in a stable ponte feels like a bandage. The number only makes sense next to the stretch of the fabric.
How much does your knit stretch?
Fold the fabric across the width, mark 10 cm (4 in) along the fold, hold the left mark at a ruler's zero and pull the right mark as far as it goes comfortably, without the fabric thinning or the edge curling hard. Stretched to 15 cm means 50 % stretch. Let go: it should return to 10 cm within a few seconds. The stretch percentage test covers two-way and four-way stretch and the recovery check in detail.
| Knit | Typical stretch across the grain | Recovery | Negative ease it tolerates |
|---|---|---|---|
| Cotton jersey, no spandex | 25 to 40 % | Fair | 0 to 5 % |
| Cotton-spandex jersey | 50 to 75 % | Good | 5 to 10 % |
| Interlock | 20 to 40 % | Fair | 0 to 5 % |
| French terry | 20 to 40 % | Fair | 0 (positive ease instead) |
| Ponte | 20 to 30 % | Good | 0 to 3 % |
| Rib knit (1x1, 2x2) | 60 to 100 % | Very good | 10 to 15 % |
| Nylon-spandex, swim and athletic | 75 to 100 % | Excellent | 10 to 25 % |
The last column is the comfortable range; it is roughly a fifth to a quarter of the stretch percentage for everyday wear, up to half for compression garments. A fabric with poor recovery grows during the day, so with it, lean toward zero.
How much negative ease does each garment need?
| Garment | Where it applies | Negative ease | Fabric stretch needed |
|---|---|---|---|
| Fitted T-shirt | Bust | 2 to 5 cm (3/4 to 2 in), about 2 to 5 % | 40 % or more |
| Regular T-shirt | Bust | None: 3 to 6 cm (1 1/4 to 2 1/4 in) positive | 25 % or more |
| Rib-knit tank or fitted top | Bust and waist | 5 to 10 % | 60 % or more |
| Leggings | Hip, thigh, calf | 10 to 20 % | 75 % or more, four-way |
| Fitted knit skirt or dress | Hip | 0 to 5 % | 40 % or more |
| Neckband | Band length vs neckline length | 15 to 20 % (band is 80 to 85 % of the neckline) | 50 % or more |
| Cuffs and hem bands | Band length vs opening | 10 to 20 % | 50 % or more |
| Knit waistband without elastic | Waist | 8 to 12 % | 75 % or more |
Length direction is separate. Negative ease across the body makes the fabric shorter as it stretches sideways, so leggings and fitted dresses gain 2 to 4 cm (3/4 to 1 1/2 in) in length to compensate; a T-shirt does not need it.
What do the numbers look like on a real body?
Take a 92 cm (36 in) bust, a 76 cm (30 in) waist and a 98 cm (38 1/2 in) hip.
- Fitted tee in cotton-spandex jersey (60 % stretch): finished bust 88 to 90 cm (34 1/2 to 35 1/2 in), finished hip equal to the body hip or 2 cm under. On the pattern, with front and back cut on the fold, that is 0.5 to 1 cm (1/4 to 3/8 in) off each side seam at the bust compared with a zero-ease draft.
- Regular tee in the same fabric: finished bust about 97 cm (38 in), 5 cm of positive ease; it skims rather than clings.
- Leggings in nylon-spandex (100 % stretch): 15 % negative ease gives a finished hip of about 83 cm (32 3/4 in) and a thigh 15 % under your thigh girth. Add 3 cm (1 1/4 in) to the inseam for the lengthwise shrinkage.
- Neckband for a crew neck with a 56 cm (22 in) neckline: 56 × 0.85 = 47.6 cm (18 3/4 in), plus seam allowance at the ends. Shorter still, around 80 %, if the rib is very stretchy or the neckline is a deep scoop that needs pulling in.
- Hem cuff on a 24 cm (9 1/2 in) sleeve opening: 24 × 0.9 = 21.6 cm (8 1/2 in).
Where should you not use negative ease?
- Across the shoulders and the upper back. The shoulder seam should match your shoulder width whatever the fit; stretching it drags the sleeve seam toward the neck.
- In the neckline itself. The neckline opening stays at its drafted size; only the band is shorter.
- With one-way stretch fabric cut the wrong way. The stretch must run around the body. Check the grainline and the "cut across the stretch" note on bands.
- With poor recovery. A cotton jersey without spandex that stays stretched after the 10 cm test will bag at the knees and seat by lunchtime.
- Over the bust on a fitted top if you want no strain lines. Zero ease at the bust with negative ease at the waist gives shape without the fabric thinning and showing lighter over the bust.
How do you add or remove negative ease on a pattern?
Width changes go on the side seams, divided by four (two side seams, each with a front and a back edge). To turn a 5 cm positive-ease tee into a 2 cm negative-ease tee, remove 7 cm in total: 1.75 cm (11/16 in) from each of the four edges at the bust, tapering back to the original line at the armhole so the sleeve still fits. Keep the shoulder, neckline and armhole depth as they are. For leggings, take the percentage off every width (hip, thigh, knee, calf, ankle), not a fixed amount, because a fixed 5 cm is 5 % at the hip and 25 % at the ankle.
Sewing choices matter as much as the draft: a stretch stitch or a narrow zigzag so the seams stretch with the fabric, a ballpoint needle, and knit sewing techniques that do not stretch the edges while you sew. Rib knit is the fabric to learn negative ease on, because it forgives a centimeter either way.
How does a drafting tool handle negative ease?
By tying the ease to the fit you choose and to the fabric type. Sewly's knit T-shirt, for example, draws the fitted option with 2 cm (3/4 in) of negative ease at the bust and zero at the waist and hip, the regular option with 5 cm (2 in) of positive ease, and cuts the neckband at 85 % of the neckline length; knit seam allowances default to 1 cm (3/8 in). What no draft can know is the stretch of the fabric on your table, so test the 10 cm pull first and choose the fit accordingly: a fitted draft in a 25 % interlock will be tight, the same draft in a 75 % cotton-spandex jersey will be comfortable.