Gift cards are a mixed blessing. On the one hand, it's free money, on the other you can only spend it in one spot. And if you would never be caught dead in that store in the first place, you can't return them for cash. What you can do, however, is sell them for a discounted price on clothing forums like SuperFuture or StyleForum, or Craigslist. You might be able to get a portion of the amount in cash, or trade it for something else. Either way, both are better than sitting on it until it expires. Or you could consider doing something nice for a change, and just give it away to someone in need or a friend who'll definitely spend it.
Consider Selling Your Gift Cards.