Your Girl Is Giving You Hints
Does your girl comment on how well dressed other dudes and celebs are? Does she compliment you when you're wearing certain outfits and say things like "I wish you dressed like that more." For most guys, wives and girlfriends are usually your main conduit into what's hot.
But on the real, you're a grown man, so you should give a shit about how you want to be presented. Think of your girl's advice more as feedback as to how you look now, and not an end-all be-all of how you should dress. By all means, take her to the store with you to get her input, but in the end, make sure you're the one dressing yourself.