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You might see a lot of bare legs if you take the train Sunday.

It’s No Pants Subway Ride Day!

The annual event started twelve years ago in New York, and has since spread to 26 countries worldwide.

The event is reportedly meant to celebrate silliness, and make people laugh and smile.

On their Facebook page, Chicago’s No Pants organizers recommended participants wear “granny panties, boxer briefs, and boy cut underwear” today.

That likely translates into wearing that is tasteful and covers a bit more.