Grateful Dead Robbie Pants Sz Medium

No idea where my son purchased these. Size Medium. Measurements in the photos. there is also 2 small spots on the pants as seen in the photos. And there is a line of discoloration. It's a faint line but I tried to get good pictures of it. 2 side pockets and a back pocket. Elastic waist. He bought them for sleep pants but wore them as regular pants. So I don't know if they're regular pants or sleep pants. 😂