I love the way Marmot jackets fit, and this is no exception! I'm 5'2" and about 118 pounds and the small is perfect - I can comfortably wear a mid-weight sweater or fleece underneath. This jacket is flattering and warm for a softshell. I wear it a lot.
This jacket is pricey, but it's beautifully made and very nicely styled. True, the pockets are a little shallow and the arms could be a tad longer, but these are small quibbles. I got the deep blue, which is a lovely lapis blue and grey subtle plaid. Very similar to the picture. I'm 5'2" and around 117 pounds, and I got the Small, which fits great over a mid-weight layer. I wish I could afford to buy another colour in XS, as I think the smaller size would be perfect in warmer weather over thinner clothing. I chose this jacket instead of the North Face Stella Grace, because I don't like the prominent North Face logo emblazoned on the chest of the Stella Grace. The Marmot label on the sleeve is much more discreet and makes me feel less like a human billboard! Very happy with this purchase :)
Hi there - I am 5'2" and 116 pounds, and the Small fits me perfectly. The jacket is a trim fit, and it's not generous in the shoulder area, so maybe a Medium would fit you more comfortably? Hope that helps!