I bought these shirts to wear alone or under tshirts. Now I'm a woman, 5'4 and 140 lbs and originally bought men's small and it didn't fit well at all. I naturally have a broad upper body and felt a small in men's size would fit well, as many others did before, but this Hanes brand didn't fit well. It was a little more snug for my liking. I wanted it a little more loose fitting. So I returned and bought a medium size and it fit a little better but in the arms was still a little snug and a little short. The material definitely gets a little bit stiffer after washing so you should put an extra fabric sheet or two in the dryer to soften them up a bit.