I dunno about let. Clothes Yoda likes. Hats and other assorted headgear he HATES. So we just put it on for a little bit and just take a picture.
He absolutely HATED his Easter Bunny costume we got him for his first Halloween. He liked his Superman outfit tho for last Halloween. I'll have to dig up those pictures sometime. For Yoda's sweaters and other gear, there is a good cutout near his belly area so he can pee easily. The sweaters also do not cover his butt area.