A Brad is someone (usually a college-aged male) who tries to impress women to hard and wears excessive amounts of brands such as Patagonia, or Vineyard Vines. Brad is your generic douchebag or "tough guy". Brad is notoriously known for thinking every single woman in the room likes him. Because of his great looks and great style, of course.
Wow that guy wearing a Patagonia hat and Patagonia shirt with those odd future socks on looks like a real brad.