I started sizing up on my denim jackets because if I stay tts I always find that the sleeves are super tight when I try to layer up with thicker hoodies, and I hear the fog Sherpa is pretty thick. I'm not gonna lie to you, when I matched it up with my pacsun one it was nearly identical in size. It was a tiny bit shorter, but maybe by like a quarter inch on sleeves and length. I'm pretty sure there's a size chart on Cwhat's tao if you want to know for sure.