My husband is a size up but definitely doesn't wear this brand. Usually men's brands don't differ much from each other, but this one didn't fit at all. According to the tag it should say "Full Fit Through Chest & Body" but we couldn't find it this time. Now, as for the shirt itself, this is a bright white casual shirt with short sleeves. He has a good collar which has kept him stiff and able to stand up quite well. I was very happy with how it looked, if it could be zipped I'd be perfectly happy with it. very nice shirt!