It's how much 'ease' or extra room the sweater has. A baggy sweater will have more ease and a slim-fitting sweater will have negative ease if it has to stretch to fit you.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry