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This thermal underwear top runs small. I am 5'5", 137 pounds and medium is the size I wear in my tops. This is tight across the chest and arms but because I wore it for a day, I can not return it. It also began to rub my underarms and is not a comfortable fit. I would strongly suggest you order a size up. Ironically on the package it says "Full cut for Comfortable fit"!
Some people were complaining about the hem and they are right. the hem is cut by hand with no care. having said that, this is a cheap shirt to wear under others so I didnt mind. It was not itchy as some people are describing its just not as soft as people want a thermal to be.