I am a woman, Size 6, 5'5 118 lbs.  I usually wear a small or medium in women's sizes.  I like my sweatshirts to be bigger and comfortable, so I bought a medium in this MEN'S sweatshirt.  I first opened it up and was a little unsure. I tried it on over a thermal shirt.  It was all bunchy...  I tried it on w/ a long sleeve shirt.  It fits a little tight.  I am certainly glad I did not purchase one for my boyfriend.  The hood on it is really small, and is really pointy!