Exactly, I remember one day throwing out (to good will) 20+ industry shirts, from events, vendors, prizes etc... because I reached an age where the social value wasn't there anymore, infact it became prohibiting towards being taken serious.

I look at the young guys I work with now getting all excited about vendor gear, smile, and reminisce about being the same age, but to me shirts are worthless (and as noted a stigma in some situations).