I'm usually a L/XL, so I ordered 2-3 sizes up (XXXL).  A little baggy, how I like it, and the arms are a little long - covers my hands which I actually like and you can pull it up a bit if you want your hands out.  The material is weird, it's not like your normal hoodie or sweatshirt material.  It's some cheaper material it seems like, but it is warm and comfortable.  I think overall it is okay and will be keeping it. I'd say to size up 2-3 sizes depending how baggy you want it.