This jacket is very warm! However, if you have a pear-shaped body type, like me, you can only wear a t-shirt under it and even then it's still constricting on the hips with thin hiking pants on.. It fits fine elsewhere but because it's constricting on the hips it bunches up making it look unflattering. Instead of a large, I probably could have gone with a medium, based on the sizing above my hips, but it wouldn't have snapped closed over my hips. I wouldn't recommend this jacket if you have wide hips (my hips are 34 and true waist is 30).