Also see No Pants Day
Expose your undies! Celebrate by wearing nothing but unmentionables in public, or at least by wearing your underwear, or somebody else’s, where people can see it so they can gawk at you. (This is a great day to apply for membership in the Lesser Disorder of Underwear Heads.)
Multiversal Underwear Day was created in 2006 by the Mythics of Harmonia. However, it was inspired by No Pants Day started by the Knighthood of Buh at the University of Texas, Austin, and by National Underwear Day started by Freshpair.