A group curse!

A curse on a group?

You mean like the soccer team that cannot win unless one of their players is nude?

Or the all-female drama club that can't perform unless ALL cast members are naked? I've heard they get quite inventive with keeping their shows PG-13.

Or the cheerleaders who lose more and more clothes with every cheer?

What about twin sisters Jill and Tracey, who can only wear whatever items of clothing that the other is without?

Or maybe we're talking about the elephant in the room, that terrible magical plague known as the Nude Flu. Contagious and rendering many a pretty female with the (sometimes permanent) symptom of being able to wear nothing from her head to her feet!

What else could we be talking about?