I feel SO GOOD in these coveralls! Perfectly comfortable and perfectly myself. This is a great long-sleeved version of the coveralls that is just right for slightly cooler weather, and I layer warm leggings underneath for colder days. I'm 5'5 and 138 lbs and the Medium fits perfectly with the waist tabs taken in to the smaller setting. There is a bit too much room in the hips, butt, and thighs for me, but it's just a loose look and still quite flattering. A small would probably fit well except it would be too short in the torso, and you definitely need extra wiggle room to feel comfortable and be able to reach up for things. The length means I can wear the legs cuffed or not, and I like being able to choose based on what shoes I'm wearing.