I am 5'3", 135 lbs, athletic, not chunky by street standards, but have a very difficult time fitting into outdoor gear, which is often made for more boyish builds. I bought a medium shirt--the color is very much as-is from the picture on the screen and it fits like a dream. Plenty of room in the chest, so I don't have the dreaded uni-boob look. The sleeves are a pinch too long, but I'm not wearing it to the office, so that's fine. Also, there is plenty of length in the torso--it comes down to my hips. Plenty of room in the waist without looking too bunchy or big. I would say that if you have an hourglass shape, this is a great shirt. Oh, and it is so warm and cozy! I wish I'd had it for skiing in the Alps last week.