I am 5'.4", 137lbs, 38B and am basically built like a tree trunk. I ordered this jacket in large and it fits perfectly. I was looking for casual, not a tight fit. It has a little weight to it so I can wear it out for quick errands if it's above freezing, but is light enough for cool summer nights. The lines/cut of this jacket make it look like I actually have a waist and is very flattering. The sleeves come down to where my palm meets my fingers with my arms at my side and that is ideal. I can lSee full review