I am a 5'4 woman. I weigh 145. I am a nursing mama so I have big breasts (32i). I can wear a small unisex t shirt but I usually prefer a medium because it gives me a little extra room. This shirt is perfect. Definitely my favorite shirt now. It's also cut long which I LOVE. My boys were so excited about all of the toy story characters on the shirt. I recommend. Plus for $10 It was a steal. The colors are vibrant and the material is soft.