fallmorelow:

Wear the same number of articles as clothing as the number of Pokemon in your party. For every Pokemon who your opponent defeats, you remove an article of clothing, and vice versa. If you’re playing the TCG, then wear the same as the number of prize cards in play. For every pokemon your opponent knocks out, you remove an article of clothing. Voila. Strip Pokemon.

This is the outcome of my battle with Ash: