Ease is the difference between your body measurement and the finished garment measurement. As a rule of thumb, a fitted woven top or dress needs about 5–8 cm (2–3 in) at the bust, a regular blouse 8–12 cm (3–4 3/4 in), a relaxed top 15–20 cm (6–8 in) and an oversized one 25 cm (10 in) or more. Knit T-shirts use far less, from about −2 cm to 6 cm (−3/4 to 2 1/4 in) for a close or regular fit. The charts below give the numbers for bust, waist, hip and sleeves by garment type.
What is ease, and why does every pattern add it?
Ease is the extra room built into a pattern beyond your body measurements. It comes in two kinds. Wearing ease is the minimum you need to breathe, sit and lift your arms: around 5 cm (2 in) at the bust and hip in a woven fabric. Design ease is everything added on top to create a style, from the slight skim of a shift dress to the volume of a boxy shirt.
Knits work differently because the fabric stretches. A T-shirt can have zero ease, or even negative ease (a garment smaller than the body), and still be comfortable. That is why the same bust measurement leads to very different pattern widths depending on the fabric and the style.
All figures below are total ease, measured all the way around the body, not per pattern piece. A front and a back each cut on the fold carry a quarter of it at each side seam.
How much bust ease does a woven top or dress need?
Woven fabrics have no stretch across the grain, so the bust is where ease matters most: too little and buttons gape or the fabric pulls toward the bust; too much and a fitted bodice looks borrowed.
| Garment and fit | Bust ease (cm) | Bust ease (in) |
|---|---|---|
| Close-fitting bodice (strapless, corset style) | 0–3 | 0–1 1/4 |
| Fitted dress bodice or blouse with darts | 5–8 | 2–3 |
| Regular blouse, shift dress | 8–12 | 3–4 3/4 |
| Relaxed or boxy top | 15–20 | 6–8 |
| Oversized top, kimono jacket | 25 and more | 10 and more |
| Unlined jacket worn over a top | 12–18 | 4 3/4–7 |
| Coat worn over layers | 18–25 | 7–10 |
The thicker the fabric and the more layers you wear underneath, the more ease you need. A wool coat with only 8 cm (3 in) of ease feels tight over a sweater, even though the same number is perfect on a cotton blouse.
How much ease does a knit T-shirt or sweatshirt need?
For knits, ease depends on the fabric's stretch percentage as much as on the style. A cotton-elastane jersey with 50% stretch and good recovery can be cut with negative ease; a stable French terry with 20% stretch cannot.
| Knit garment | Bust ease (cm) | Bust ease (in) |
|---|---|---|
| Bodycon or very fitted top (high stretch) | −5 to −2 | −2 to −3/4 |
| Fitted T-shirt | −2 to 0 | −3/4 to 0 |
| Regular T-shirt | 3–6 | 1 1/4–2 1/4 |
| Relaxed T-shirt | 8–12 | 3–4 3/4 |
| Regular sweatshirt or hoodie | 10–15 | 4–6 |
| Oversized tee or sweatshirt | 20–30 | 8–12 |
Bands are the exception to the rule. A T-shirt neckband is cut shorter than the neckline it is sewn to, typically 80–90% of its length, so it hugs the neck instead of standing away from it.
How much ease at the waist and hips for skirts and trousers?
Waist ease is small because a waistband has to hold the garment up. Hip ease is larger because you sit, and sitting widens the hips by several centimeters.
| Garment | Waist ease | Hip ease |
|---|---|---|
| Pencil skirt (woven) | 1–2 cm (3/8–3/4 in) | 4–5 cm (1 1/2–2 in) |
| A-line skirt | 1–2 cm (3/8–3/4 in) | 6–10 cm (2 1/4–4 in) |
| Fitted trousers (woven) | 1–2.5 cm (3/8–1 in) | 4–6 cm (1 1/2–2 1/4 in) |
| Straight trousers | 2–3 cm (3/4–1 1/4 in) | 8–12 cm (3–4 3/4 in) |
| Wide-leg or pull-on trousers | Elastic | 12–20 cm (4 3/4–8 in) |
| Circle or gathered skirt | 1 cm (3/8 in) or elastic | Not needed (the skirt flares) |
Elastic waists follow their own rule: the cut waist must slide over your hips, so it is at least your hip measurement plus 4–5 cm (1 1/2–2 in), and the elastic is shorter than your waist, often around 90% of it. The elastic length calculator does the arithmetic for different elastic widths.
How much ease does a sleeve need?
Measure your upper arm at its fullest point. A fitted woven sleeve needs about 5–6 cm (2–2 1/4 in) of ease around the bicep, a regular sleeve 7–8 cm (2 3/4–3 1/4 in) and a relaxed one 10 cm (4 in) or more. In knits, 1–4 cm (3/8–1 1/2 in) is plenty.
The sleeve also needs cap ease: the sleeve cap is drafted slightly longer than the armhole so it curves over the shoulder. Expect 1.5–3 cm (5/8–1 1/4 in) on a woven set-in sleeve and almost none on knits or dropped shoulders. If you struggle with puckers at the sleeve head, too much cap ease for your fabric is a likely cause.
How do you check the ease of a pattern before you cut?
Most patterns print a table of finished garment measurements. Subtract your body measurement from the finished one and compare the result with the charts above. If a pattern only lists body sizes, measure the flat pattern pieces along the bust line, leave out the seam allowances, add the pieces together, and double the total if they are half pieces.
The other reliable method is to measure a garment you already like. Lay it flat, measure across the chest 2.5 cm (1 in) below the armholes, double it and subtract your bust. That number is the ease you enjoy wearing, and it is worth writing down for every type of garment you own.
Tip: When you hesitate between two amounts of ease, choose the larger one for woven tops and the smaller one for knits. It is easier to take in a side seam than to find width that is not there.
How does Sewly decide how much ease to add?
In Sewly, the fit option of each pattern (fitted, regular, relaxed or oversized) sets the ease from your own measurements. A woven top, for example, gets about 6, 10, 16 or 28 cm (2 3/8, 4, 6 1/4 or 11 in) at the bust from fitted to oversized, and a knit top about −2, 5, 12 or 24 cm, with matching amounts at the waist, hip and upper arm. The finished measurements are shown next to the pattern, so you can compare them with a garment you own and change the fit before printing.
For the fundamentals in more depth, read the guide to wearing ease and design ease. And since ease is only as good as the body numbers it is added to, follow how to take your body measurements before you choose.