Halloween // Trying to find a TWO PIECE superman costume!

My uncle has cerebral palsy. He is in a wheelchair and cannot wear a one piece costume because of his limited mobility. He requires seperate top and bottoms. I've been on the hunt for a 2 piece superman costume for him, because he loves superman and we were planning on dressing up his dog as krypto, but I cannot find one anywhere. I figured here would be a good place to ask around and see if anyone had any ideas on altering a one piece costume if necessary or if anyone knows where I should look. Thank ya'll in advance !