Many thanks to Sara who sent a link to a video from Improveverywhere where a group of New Yorkers travelled on the subway without any trousers and bizarrely got themselves arrested:
"One frustrated cop freaked out and called in 25 more. 8 were ticketed and summonsed to court, 6 of the 8 were handcuffed and traveled in police vans to a precinct. Everyone has been released and is fine."
With some of the microskirts we've seen on the Tube, I'm not sure if anyone in London would have even noticed, but where is the crime in travelling around on the subway with no trousers? Perhaps if Pantless Subway Riding was labelled as performance art the participants would have been given the Turner Prize? Do you think the same thing would have happened on the Tube?
There have been occasions when Circle Line Parties have been stopped due to the police being a bunch of killjoys. Perhaps the powers that be are just happy with keeping the Underground a miserable place where you can't have any fun, you can't talk, you can't have a laugh or even try to get fellow passengers to have a double-take.