I think that "club wear" in this context is garments worn to clubs, ie, night spots with music/noise, drinking, etc. I have heard people who go to these places referred to as "clubbers", and apparently there's a lot of freaky clubs out there. My impression is that they're a bunch of poser kids/attention whores who are participating in the reckless sensual candy store of shocking youth culture. It doesn't really have much at all to do with AB/DL. The related links on that site appear to confirm this.