Sweater Fit: Tips for the fit you want!

By Kelsey Peterson

Ever knit a sweater only to find that it doesn’t fit the way you want? Or are you afraid to knit a sweater only to find, after hours of work, that it doesn’t fit? Sweater fit is something that you learn a bit as you go, as you learn what sweater preferences you have in fit, ease, shape, and length. But I’m hoping you can learn a bit from what I’ve learned knitting sweaters for myself and for others, to save you learning the hard way!


Two pieces of information in any sweater pattern will help decode how it will fit: the construction and the recommended ease. Sweaters can be constructed in several ways, the most common appearing to be (A) round yoke, (B) raglan, and (C) set-in sleeve.

Altheda Sweater hangs on a hanger

A) Altheda sweater by Jennifer Steingass, a round yoke pullover knit in Plotulopi

Flat lay of gold Vanilla sweater, yarn and tote

B) Vanilla Sweater by Corinne Tomlinson, a raglan pullover in Finullgarn

Model wears cream Audrey in Unst cardigan

C) Audrey in Unst by Gudrun Johnston, a set-in sleeve cardigan

Round yoke sweaters are the classic Icelandic sweaters with a round pattern around the shoulders and increases happening evenly around the round in usually 3 to 5 increase rows. Raglan sweaters have diagonal increases from the collar to the underarms - like a classic baseball T or lots of sweatshirts. Set-in sleeves are usually knit flat (at least the top) and then sleeves are knit separately and sewn in afterwards, creating vertical seams from the top of the shoulder to the underarm. 

OK, but what does this have to do with fit? The different sweater types generally need different amounts of ease! Ease is the difference between your actual bust measurement and the garment’s bust measurement. In a pattern, a designer will usually give a recommended amount of ease, which tells you how much larger than your actual bust the designer had in mind when they designed the pattern. Because of the constraints of the type of construction, different types of sweaters often look better with different amounts of ease. Round yoke sweaters usually need more ease, then raglans in the middle, and set-in sleeves with the least. If you come across a pattern that does not say what ease is recommended, I’d think about doing a little more for round yoke, a bit less for raglan, and the least for set-in sleeve patterns. 

Schematic for Vanilla Sweater

How about some examples? OK! Here are the finished garment measurements for the Vanilla Sweater: 34 1⁄4 (38, 42, 46 1⁄2, 50 1⁄2)(54 1⁄4, 58 1⁄4, 62, 66) in. The recommended ease is 3 ½ to 6 inches of positive ease and the sweater is a raglan type construction. If, for example, a person had an actual bust size of 46 inches, what size should they knit? Adding the lower recommended ease of 3 ½ inches to 46, you get 49 ½ inches and adding the higher ease, you get 52 inches. The only size that falls between those numbers is 50 ½ inches, so the recommended size is Size E. 

Personal Preference!

Now, you can actually take all of that and throw it out the window if you want! The best way to actually figure out how much ease YOU like is to measure a sweater that you like to wear. It can be handknit or commercially made, but it’s the most helpful to match the construction style - which you can tell by the seams or lines around the shoulders. Round yokes have no visible lines of increases or seams around the shoulders, raglans have diagonal lines of increases, and set-in sleeves have vertical seams. You may decide that you like a close-fitting sweater with 2 inches of ease or even zero ease! You may also decide that you like an even looser sweater and want 8 inches of ease or more. 

If you figure out you like certain amounts of ease, you have two options. You can either pick patterns with that recommended amount of ease or you can knit whatever pattern you like with that amount of ease. 

Last Considerations

I know this is a lot of information, but there is a little bit more that can help avert disaster. Different knitting techniques make sweaters more or less stretchy. The most important to note is that colorwork (including Fair Isle and Scandinavian style colorwork) are less stretchy than knitting with one color (stockinette, garter, or even most textures or cables). For that reason, it’s a bit riskier to knit a full colorwork sweater, at least with colorwork across the bust, with less than 2 or so inches of ease. That said - it’s not as much of a concern with colorwork across the yoke or around the hem and cuffs, so there are still options for close-fitting sweaters with colorwork. 


  • This summer I knit two linen blend sleeveless sweater cast on 124 stitches for front and same for back.Over 40 years ago I knit an Aran style sweater. I have many baby cardigan sweaters. I have gone to Soma and been measured.This an adventure design my own sweater but with my shape it is the best solution. I have had 4 children and have done weight lifting in the form of lifting 25 pound boxes of license plates for over 20 years so my upper arms are not skinny. Thank you for your support we appreciate all your ideas.Tyral Spence

    Tyral Spence
  • Terrific summary of information critical to getting the fit you want in a sweater! The one construction style I would add would be drop shoulder. These tend to include classic ganseys and the newer boxy styles with wide bodies and narrow sleeves. These typically require of positive ease in the body to allow the shoulder to drop off the natural shoulder line for comfortable arm movement. However, too much ease, especially with fabric without adequate drape can create bulk under the arms. Again, thanks for providing this excellent information.

  • Wonderful tips. Thank you very much. I now have a better understanding when I do the measurements to decide which size to do for the 2022 Sweater KAL.

    Patti-Ann Kubacki
  • Thank you for the fit explanation. It is so confusing to learn sweater construction. I am new to garment knitting and I love the challenge. I am doing the Altheda which I purchased the yarn already. I think I am ok with the yardage-thinking now of going up one size after reading your post.

    Joni D
  • Thank you, that is really clear and easy to understand.

1 2 3

Leave a comment

Please note, comments must be approved before they are published