Public transport in major cities were crammed with bare-legged travellers
Participants are required to dress normally on their top halves
Yearly event began in Sydney and was marked in places including Beijing
London Undergound users also took part in the 'celebration of silliness'
Stunt began in New York in 2002, where only seven people attended
Now thousands of people take part in the prank in 60 cities every year
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