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Understanding garment sizing and ease

Why a size 3 in one pattern is not a size 3 in another, how ease decides the fit, how to measure yourself, and how to pick a size from a schematic.

By The StudioPublished Aug 9, 20264 min read

A crochet garment pattern does not have sizes the way a shop does. It has finished measurements: the actual width and length of the sweater once it is made and blocked. The size you choose is the one whose finished measurements will fit you the way you want, and the gap between your body and the garment is called ease. Understand ease and a schematic, and you will never make a sweater that does not fit again.

What ease is

Ease is the finished garment measurement minus your body measurement at the same point. Positive ease means the garment is bigger than you: a relaxed sweater with 15 cm of positive ease at the bust is 15 cm wider around than your bust. Negative ease means the garment is smaller than you and stretches to fit: a ribbed beanie or a fitted tee. Zero ease skims the body.

Ease at bust	Fit	Typical for
-5 to 0 cm	Close fitting, stretchy	Ribbed tops, hats, fitted tees
0 to 5 cm	Fitted	Fitted cardigans, camisoles
5 to 10 cm	Classic	Most cardigans and pullovers
10 to 15 cm	Relaxed	Drapey sweaters, summer tops
15 to 25 cm	Oversized	Boxy tees, slouchy pullovers
25 cm and up	Very oversized	Cocoon cardigans, wraps

Every garment pattern in this shop states the ease it was designed with, in the pattern notes and on the pattern page. The sample was photographed at that ease. If you want a different fit, choose a different size; the design does not care.

Measuring yourself

1
Bust or chest: around the fullest part, over the underwear you will wear with it, tape level and snug but not tight.
2
Upper arm: around the widest part of the arm. Sleeve ease is separate from bust ease and matters for comfort.
3
Shoulder to hem: from the top of the shoulder next to the neck straight down to where you want the hem.
4
Arm length: from the underarm to the wrist with the arm slightly bent, for sleeve length.
Or measure a garment you like the fit of, laid flat, and compare it directly to the schematic. This is the quickest method and often the best.

Reading the schematic

The schematic is the line drawing of the garment with measurements for every size. The numbers are finished measurements of the garment, after blocking, laid flat and doubled where needed. Add your chosen ease to your bust measurement and find the size whose finished bust is closest. Then check the other measurements for that size: upper arm, length, yoke depth. If the bust size gives an upper arm that is too tight, the pattern usually explains how to adjust the sleeve independently; ours do.

If you are between sizes, the fabric decides. A drapey fabric or an open stitch can go up a size; a firm fabric with structure goes down. And a garment worn open, like a cardigan, tolerates being smaller than one that closes.

Length is negotiable

Width is fixed by stitch count and gauge, so the size choice is about width. Length is usually worked to a measurement, and the pattern marks where to add or remove rows: in the body before the hem, in the sleeve before the cuff. Lengthening uses more yarn; allow roughly ten percent more per 5 cm added on a sweater.

Why sizes have numbers, not letters

Patterns here use sizes 1 to 9 rather than S to 5XL because letter sizes mean different things in every shop and carry judgments nobody needs. Size 1 is a 76 cm (30 in) body bust; size 9 is 157 cm (62 in). The finished bust for each size depends on the ease of that design, so a size 4 relaxed sweater and a size 4 fitted tee have different finished measurements but fit the same body. What you need to know is always the finished measurement and the intended ease, and both are on every pattern page.

The rest is gauge. A perfect size choice at the wrong gauge is still the wrong size, so make the swatch, block it, and only then pick your size. The Harbor Raglan Sweater is a good first garment for exactly this reason: it is tried on as you go, so the schematic is checked against your body before the sleeves exist.

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