I recall a Patong bar (Superboys?) where the guys either danced naked or sported strange (papier-mache?) garments like cricketers' boxes which were coated with phosphorescent paint. The lights would be turned off and the resulting spectacle was ...unusual.

I recall nudity in Screw Boys when it was in Soi Twilight. and, in Pattaya occasionally in the bar which eventually became Nice, as Chuai-Duai mentions.

Adam's Apple In Chiang Mai had an interlude in their show in which the go go dancers would appear naked ...and just stand there. Some clearly were uncomfortable; and so was I on their behalf.