You sound awfully judging of the girls in this town, and you were rather rude, bragging about your Hermés clutch whilst insulting someone else at the same time like a spoilt nouveau rich teenager. Sure, call someone out on being rude but that was just a little bratty.
Anyway, I wanted to suggest that perhaps jeans aren't the right thing to wear room a club. You may not respect the town you're in, but try not to make it too obvious. Try to be a little more considerate of others. It doesn't matter if your clutch cost more than the entire club - it's not the tag that counts; it's the thought and the creativity that goes into your look. Hell, my best friend's grandfather goes to meetings in Parliament wearing charity shop clothing. So please, try to be a little more respectful and a little less obnoxious.
I'd say you could go with a dark skirt instead. If you want to look a little more 'don't care ish' try a pair of nice black flat boots.
PS. Also, no one 'owns' nonprofit organisations honey. Set up, yes. Anyone can teguster a chatity number. A trustee, sure. But there's usually a board, and there's nearly always at least two or three. More in a decent sized charity.