These are so soft and light and feel like a second skin, yet still look smart.... which is just what you want for sleeping/lounging in. However, leg length quite long for my height (5ft 5ins) and although the lightness of the silky modal fabric feels lovely, it is very unforgiving and shows all lump...s and bumps. For that reason getting a looser size (which can always pull in with waist drawstring) looks more drapey and flattering. I'm U.K. size 12 and Med fits well, but also got Large for more bloated days and to be looser. Bought black and grey, but returned grey because just too see-through. They wash well and dry quickly, but some of Gap's modal items do tend to have a slight weird chemical smell to them, but it does lessen/clear if use nice fabric conditioner and when they are dry again. Finally, as per usual, Gap ruin comfort factor by sewing in a clump of labels into the seam. Being extremely careful I was able to unpick them and remove, but it's always an annoying issue.