On Sunday, January 8, the New York-based prank collective Improv Everywhere asks that all New Yorkers ride the subway without pants. The event begins at 3 p.m. (more information here).

To prepare you for this (and to give you some idea of how others have dressed for the occasion), here's a collection of photos from the event's history.

And don't forget to check back Monday for the best photos from 2012's No Pants Subway Ride.