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Scores of half-naked Londoners are set to ride the Tube en masse as part of this year's No Trousers on the Tube Day.

More than 100 people have already pledged to brave the cold temperatures and join the event, which will take place on Sunday afternoon.

It is part of the worldwide No Pants Subway Ride which began as a small prank in New York in 2002 and has since spread to over 60 cities around the globe including Tokyo, Jerusalem and Moscow.

Last year 300 Londoners took part in the gimmick, which always takes place in early January and urges travellers to try and keep a straight face during the stunt.

This year marks London’s ninth No Trousers Tube Ride stunt and organisers The Stiff Upper Lip Society are encouraging people to join the group in Westminster before an hour and a half of riding trains and then an after-party.

“At 3pm, participants will be organised into groups, and will walk to a nearby station,” the event information read.

“When told to by your group leader, remove your trousers, and put them into your backpack.

No Trousers Tube Ride 12 show all No Trousers Tube Ride 1/12 Some passengers drew more attention to themselves than others EPA 2/12 Hundreds of passengers took part in the bizarre annual event EPA 3/12 Londoners on trains all over the capital saw far more than they wished to EPA 4/12 Just a normal Tube journey... but no trousers EPA 5/12 A group of brave passengers is snapped at Elephant and Castle EPA 6/12 Chilly EPA 7/12 Travel in style EPA 8/12 Passenger frolick on London's Bakerloo line EPA 9/12 The phenomenon was born after seven friends in the US boarded the New York subway without their trousers for a joke EPA 10/12 Mind the gap EPA 11/12 Nothing to see here EPA 12/12 Passengers leg go of their inhibitions EPA 1/12 Some passengers drew more attention to themselves than others EPA 2/12 Hundreds of passengers took part in the bizarre annual event EPA 3/12 Londoners on trains all over the capital saw far more than they wished to EPA 4/12 Just a normal Tube journey... but no trousers EPA 5/12 A group of brave passengers is snapped at Elephant and Castle EPA 6/12 Chilly EPA 7/12 Travel in style EPA 8/12 Passenger frolick on London's Bakerloo line EPA 9/12 The phenomenon was born after seven friends in the US boarded the New York subway without their trousers for a joke EPA 10/12 Mind the gap EPA 11/12 Nothing to see here EPA 12/12 Passengers leg go of their inhibitions EPA

“For the remainder of the journey, sit in the car as you normally would. Read a magazine or whatever you would normally do.”

The organisers added: “You can wear fun underwear if you like, but nothing that screams out, 'I wore this because I’m doing a silly stunt.'

“Wear two pairs of underwear if it makes you feel more comfortable.

"Don’t wear a thong or anything else that might offend people.

“Our aim is to make people laugh, not p*** them off.”

They added the event is “always a blast” and assured people they would not be chilly as the entire trouser-less part of the event is underground.