If this were a client facing job, as it sounds, then I think that the issue was with the colors and patterns and had little to do with the brands. It sounds like his boss would simply prefer he dress in a subtle Fashion.
Politicians often wear expensive brands, even by SF standards, and the general public is rarely knowledgable of that fact.
My fiancé often wonders why I wear 'boring' colors and patterns, this is the reason. Not so much for the coworkers, but really for the clients. No one really wants to deal with the guy who dresses like he's at the club.
Ps. Stop trolling.