I thought I would write a quick review for size reference since so many seem to think this jacket runs small. Normally I am 5'8" and about 145lbs with an athletic build and I think a medium would be perfect and a large if I wanted to wear bulky clothing under it. However, I am currently 6 months pregnant and needed a rain jacket for this fall/winter to keep up with my toddler who likes to play outside in the rain. I ended up ordering a XL because of all the reviews saying how small this jacket runs and its huge! Even at 6 months pregnant! Ill probably keep it because it cinches at the bottom and in the sleeves... but I will probably still be able to zip this thing when I am 9 months pregnant and wearing lots of clothes under it!