The jacket is intended to have a boxy fit. I am 5'7" 145-150 lbs and the XS fits me perfectly. Now when I say perfectly that does not mean that it's a super fitted jacket. I mean that the sleeves hit right at the top of my hand, the hem reaches a couple inches past my waist and the chest is somewhat fitted. Again, it still has a boxy fit though with a slight flair at the hips. If that is something you don't want, it'd suggest a different jacket.