I'm a young professional, so while I have my "work clothes" and my street clothes, that doesn't make me any less of a shopper!
I have found that going in there in jeans and a polo will not get me the same service that I receive in slacks and a shirt. On general principle, that is not how a store that preaches customer service should treat people going there to spend money on well price and decently made clothing.
I'm a firm believer in voting with your dollars, and unless I'm in a pinch (their tailoring services are very fast), I go elsewhere.
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