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Ever sat on the hot, sweaty London Tube and felt inclined to strip off? Chances are you're not alone and even better – there's a day specifically designated to this every year.

Yes, No Trousers On The Tube Day is a thing and it's back for 2020 to celebrate its 11th anniversary of flashing flesh in London.

From the budgie-smuggler ban to a boozy after party, here's everything to know about the eccentric event.

What is No Trousers On The Tube?

It’s pretty self-explanatory — Londoners strip down to their underwear and ride the tube.

This year, it starts in Chinatown, with those taking part urged to arrive in full clothing. They'll then be given the signal to part ways with their trousers.

Participants will split into groups and take to the trains, travelling around town before returning to O'Neils​ in Soho for an after-party.

Last year hundreds of travellers decided to ditch their lower garments and ride the tube — many sporting brightly coloured underwear.

The annual event is part of the worldwide No Pants Subway Ride, which began in New York in 2002. It's since spread to more than 60 cities around the globe, including Berlin, Lisbon and Toronto.

In pictures - No Trousers Tube Ride 2019 16 show all In pictures - No Trousers Tube Ride 2019 1/16 People on the Underground as they take part in the No Trousers Tube Ride PA 2/16 Passengers ride a Jubilee line train as they take part in the annual No Trousers Tube Ride AFP/Getty Images 3/16 Passengers read while riding a Jubilee line train AFP/Getty Images 4/16 It's the 10th annual No Trousers Tube Ride in London AFP/Getty Images 5/16 People walk to a Jubilee line train AFP/Getty Images 6/16 Passengers step off a Jubilee line train AFP/Getty Images 7/16 People pose for a photograph at Canary Wharf AFP/Getty Images 8/16 Passengers ride a Jubilee line train AFP/Getty Images 9/16 Passengers wait at the foot of the escalators at Canary Wharf AFP/Getty Images 10/16 People pose for a photograph at Canary Wharf AFP/Getty Images 11/16 People on an escalator on the Underground as they take part in the No Trousers Tube Ride PA 12/16 Half-naked Londoners at Green Park PA 13/16 Awaiting the train at Green Park PA 14/16 People on the Underground as they take part in the No Trousers Tube Ride PA 15/16 People on the Underground take part in the No Trousers Tube Ride PA 16/16 People on the Underground as they take part in the No Trousers Tube Ride PA 1/16 People on the Underground as they take part in the No Trousers Tube Ride PA 2/16 Passengers ride a Jubilee line train as they take part in the annual No Trousers Tube Ride AFP/Getty Images 3/16 Passengers read while riding a Jubilee line train AFP/Getty Images 4/16 It's the 10th annual No Trousers Tube Ride in London AFP/Getty Images 5/16 People walk to a Jubilee line train AFP/Getty Images 6/16 Passengers step off a Jubilee line train AFP/Getty Images 7/16 People pose for a photograph at Canary Wharf AFP/Getty Images 8/16 Passengers ride a Jubilee line train AFP/Getty Images 9/16 Passengers wait at the foot of the escalators at Canary Wharf AFP/Getty Images 10/16 People pose for a photograph at Canary Wharf AFP/Getty Images 11/16 People on an escalator on the Underground as they take part in the No Trousers Tube Ride PA 12/16 Half-naked Londoners at Green Park PA 13/16 Awaiting the train at Green Park PA 14/16 People on the Underground as they take part in the No Trousers Tube Ride PA 15/16 People on the Underground take part in the No Trousers Tube Ride PA 16/16 People on the Underground as they take part in the No Trousers Tube Ride PA

When is No Trousers On The Tube ride?

The 2020 event will take place on Sunday January 12.

The event will start at 3pm in Chinatown opposite Canton Restaurant from 2.30pm, returning to O'Neils on Wardour Street in Soho for an after-party.

How to participate in the No Trousers On The Tube ride

The Stiff Upper Lip Society say anyone can take part in the event, which at the time of writing has 360 people attending and more than 1,400 interested on Facebook.

Organisers stress, however, that participants should "avoid thongs/budgie-smugglers/anything see-through though" as they "aim to amuse, not offend, fellow Underground users.”

It’s also advised to bring a suitable backpack or bag to carry around disregarded garments while joining in, as well as an Oyster card or travelcard for the trip around town.

Is it legal?

The event is not breaking any laws as underwear is worn.

However, organisers state on the Facebook page that they “want the event to be fun and safe for everyone for many more years to come” and “anybody found to be removing more than their trousers, or acting out personal fantasies in public, will be reported to the British Transport Police, and station authorities.”

In other words – keep enough of your kit on, and don't be weird.

Which London underground lines will be taken during the ride?

Any Tube line can be taken during the event but the length of travel time is left up to riders. It's likely that most revellers will stick to zone one.

For more information, visit facebook.com