Ordered these for sleeping and casual wear. I ordered XL for a "less snug" fit. I am 5'5"', weigh 170 lbs, and wear 36C. My first purchase was L, which I love, but wanted XL to sleep in since L is very snug, and I don't need "them" standing tall in my sleep, only in my dreams...lol

For comfort, size up. I will definitely order these again. I purchased these colors so that I could tell the different size at a glance. Very comfy to sleep in.