I've had the idea for a gag involving someone changing back to normal while wearing tight clothes - like leather or spandex in this case - as far back as TF-Media. Transformation based slapstick and all, like the other joke of someone's clothes changing with them at first, but not when they turn back. It kept popping into my caption ideas for a while, so I finally made a story out of it.

When thinking of the best setting for something like that to work, and a comic convention was the first thing to come to mind. Though it probably lost a bit of the intended funny along the way.