What did I look for?
Depended on the store.
My junior year, I worked at the two-story French Connection in Washington DC.
Honestly now? What I looked for was a guy with original style (this is when aviator sunglasses were coming into fashion, snugger-fitting pants, etc.) and a hot girlfriend. LOL. Truthfully. Those guys would drop insane cash. I made a beeline to this sort of douche and kept feeding him crap from our newest, most expensive lines until I got the credit card.
Who is the type to drop crazy cash a store that charges many hundreds or thousands for shoes? Could be the old man in the bespoke suit and trenchcoat with the $5,000 briefcase. Could the this guy's wife. Could be anything. But there is definitely a type, all I'm saying.
When I shop for suits/shoes, I dress up a bit. Have to. No tie, but maybe a navy sportcoat, tailored khakis (slim fit, no break, 2-inch cuff), sloops/loafers (no socks), checked sportshirt, etc. The business-guy-on-holiday thingie. As was stated earlier in this thread, sure, you get guys in flip-flops buying Brioni suits. It happens. But I don't want to have to prove myself to get attention from a sales associate. I want to look the part so that I'm fighting them off. I've been on the other side of the equation, so I know how it works! Not endorsing the model, just explaining it from my perspective.