No Trousers Day London:   A scene in London's metro has left people shocked. Full clothes above the waist but only an innerwear below the waist. Yes, you heard it right. Let us tell you that on Sunday the average temperature of London was 4 to minus 3 degrees but still the people of London were seen without trousers in the metro. They were wearing shoes and socks on their lower feet but without any pants.

In fact, festival-loving Londoners were celebrating London tube no trousers day on Sunday . That is, the day when they were not supposed to wear trousers, pants, pyjamas in the London metro. Let us tell you that the metro in London is called tube.

Girls and women were also seen in this campaign and they too were seen wearing only underwear below the waist (travel in London metro without pants) .

Similar crowds gathered at Waterloo, Westminster and South Kensington stations, the BBC reported.

In several photos and videos, passengers were seen descending escalators, taking selfies on platforms or posing inside bus compartments, revealing the colour of their underwear.

According to The Independent, in a post on Facebook, the event organisers asked participants to wear normal or plain pants as much as possible so that it looks like you forgot your pants.

"There's no real purpose behind the event other than to bring a little bit of light-hearted fun to the dreary midwinter season," Dave Selkirk, a 40-year-old personal trainer, told The Associated Press. "There's a lot of bad stuff going on, a lot of stuff that's not fun. It's nice to just show off and do something."

Let us tell you that there is a tradition of celebrating the day without trousers in the world. This day is being celebrated in Berlin, Prague, Jerusalem, Warsaw and Washington DC. This celebration took place in New York in 2002 but by the time it reached London, it was 2009.

Miriam Correa, who joined the craze, had a purpose. The 43-year-old chef wanted to come because she had seen photos of pantsless rides featuring a lot of thin, scantily clad women.

'I am a real woman,' she said, adding that there is no reason to be ashamed of your size. ‘All bodies are perfect.’

"The main aim is to create unexpected moments of joy, delight and confusion," Charlie Todd, who conceived the craze, told the BBC.

He said, "I am very happy to see this tradition alive, its just for harmless entertainment without any purpose.

Explaining the purpose of his show, Charlie Todd said, "Of course, we live in an environment where people like to fight cultural wars and my rule in New York has always been that my goal is to entertain other people, to make people laugh. It's not to provoke or offend anyone, so hopefully that spirit continues."

At London's Chinatown subway station entry gate, dozens of people walked through snowy streets to Piccadilly Circus underground station in central London, where they boarded their first train, fully clothed.