The dressing up is an interesting one. I always felt uncomfortable wearing formalwear on the subway in rougher areas at night. No one bothered me though ( because of clothes, I got the usual aggressive riders other times).
Though strangely enough a friend of mine was told off by security for taking off her heels while sitting down (they hurt a bit) but at the same time ignoring the boobs girl altogether lol.
Berlin is even (way) crazier by the way. Though I'm not sure how they would deal with this in public there, Germans can be a bit more formal in that sense :)
Interesting, I didn't know about that movement.