pajama pants

pajamas in general are something I personally tend to associate with kids. not to say adults do not wear pajamas or pajama pants but when I think of who wears pajamas kids come to mind. I noticed a little trend about a week ago and that is teenagers wearing pajama pants with beer company prints. now when I think of beer and who drinks it I think of adults. Is it ironic that pajama pants (associated with youth) are made of beer prints (associated with adults) or is that just really clever marketing trying to get the young people to look "cool" and buy the product.... when they are old enough to enjoy it?