This is very much a recent phenomena, prior to around the early noughties, you rarely saw anyone in bags vests and circle skirts.
In fact we once went out fully kitted out as fancy dress for a Xmas do (including wigs) as a laugh, probably 1999 or 2000 - if there had been anyone in Roxy Threads there 'seriously' the joke wouldn't have been funny.
It all ties in with returnees and the misplaced nostalgia in the scene - where people are more interested in what colour piping on there circle skirt matches the ribbons in their pigtails whilst listening to the same 100 tunes, than dressing normally and havig a progressive attitude to the music.
It's ruined the scene for me, and many of my friends.