They are very, very comfortable. I've marked them as slightly large. Now the shirt fits about as expected and most of the pants fit as well. However, my legs are maybe a foot longer in pants, they'll still cover me "from toe to chest," as they say. I have long legs and creases at the knees because my pants are so long I just don't know what to do with them. The section above the crotch also stretches to what I would call an old lady size. The trouser legs are narrow cut. Not uncomfortable but definitely tight. You can wear them under your jeans without worrying about your ankles getting high. The shirt is also tunic-length and reaches mid-thigh on me. The sleeves are amazingly long and the neckline is perfectly balanced, exposing your skin to the cold and suffocating you. All in all, I'm actually happy with them. If necessary, I can always trim the excess length of the pants or lower the waist and remove the excess. But you can't add more fabric, so the extra length in all directions is a good thing rather than a bad thing. The set is soft and quite warm, but I'm not sure I would call it the right kind of thermal underwear. I work in a pretty cold hospital. I bought these to replace some of the Cuddleduds thermos which are very worn and getting quite thin. Swimwear is still warmer than this even after years. However, I give them top marks as they become my number one favorite pair of winter pajamas. To help me interpret my comments on length, I'm 5ft 6in, about 150lbs, with a short waist and fairly long legs and arms.
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