I notice all of the above.

Many of those things are provocative in vanilla land as well so I am not sure if the vanilla women wearing them are getting a kick out of sending "Am I kinky or not?" signals.

It doesn't happen much this time of year.

Fall seems to be the season for boots, tights, faux leather jackets, etc.

As far as collars and bdsm jewelry go I've only ever noticed *very) young Goth women wearing those out in public.