So watched the season finale of season 6 for the show Community on Yahoo (Screens) and was humorously surprised for not one take...but several takes of the character "Deen" pop on screen in nothing but a disposable diaper. The episode in question is called Emotion Consequences of Broadcast Television, varies character give their pitch for "season 7". Can be found here: https://screen.yahoo.com/community/community-episode-13-emotional-consequences-070001302.html
If you just want to view the scenes in question, in order they are at around 5:40, 8:30 (dancing in a diaper), Deen runs in just diapered at 11:44, 15:05 Deen asks the question "What about this diaper thing? Is it about shaming me?" later mentions he'd rather has his diaper back after being dressed as a tranny in another characters season 7 pitch.
Screen captured the first instance.