This issue about clothes is very common in kids with adhd. Some adhd kids seem to be hypersensitive to the way clothes and certain types of material feels against their skin and/or the way they fit. These types of clothes & fits made my son miserable until we just learned to go with the flow and let him wear what he wants most of the time.! I think you should just let him wear what is comfortable. If he's like my son this issue is not going to go away, so ya might as well do what you did, if that's what he's comfortable wearing.