Metro riders in LA are expected to gather at the Red Line's Hollywood Highland station on Sunday for the sixth annual "No Pants Subway Ride."

The event was started by an improv group 13 years ago in New York City and has spread to 60 cities worldwide.

Participants in LA will ride the Red, Gold and Expo lines and make their way to Union Station to change trains.

Metro says riders must be fully dressed from the waist up and not naked from the waist down.

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