Force-field powers that won't let the clothes fit on them.
Assassin comes in through the bathroom window, in a moving swordfight, the target retreats to the living room, the hallway, the front yard.
Ancient norse curse, like that thing with the otter skin, and you just absorb the clothes. Luckily, a t-shirt doesn't gain you a lot of weight.
Disguises- Tom and Lucy Little have to dress up as rats- with nothing but brown paint and dust bunnys to wear.
Trapped in a zero-g room and tormented by the ship's AI, you can never catch your clothing.
The Band is booked at a nudist colony.
Lisa ate the brownies and is now on a park-wide wonderland rainbow journey.