Nath - forgive me if I'm wrong, but you seem to just be looking for a justification to wear leather (e.g. by comparing yourself favourably to vegetarians who eat fish)? If that's the case, then you've obviously made your mind up that your love of fashion trumps your vegetarian convictions. That's fair enough, but it would be better to acknowledge that and live with the tension, rather than trying to justify it, imho.

In terms of helpful suggestions, does wearing vintage ease the conscience? Or longer term, is there a business opportunity here for an enterprising young fashionisto...?