I have a few sweat shirts from this brand and they are usually oversized, it's always on the description and says it's oversized. I wear a size large for regular clothes. I ordered my regular size and it's pretty baggie and perfect. If you want a snug fit I suggest ordering down a size, if you want an extra baggie size order up once. For reference I am 5'6 and weigh 160 pounds and my bra size is a small C.