Opinions?

Remember how on Saturday, I got me a kick-ass gorgeous dress at Lord & Taylor? Well, I now have a card that is good for 25% off regular OR sale merchandise at L&T, from Oct. 21 through Oct. 25. Question: would it be possible, and should I try, to return the dress and then re-purchase it with that coupon? I mean, FOUR DAYS AFTER I BUY THE THING, this damn coupon comes to me! GRR. I mean, I sincerely doubt I could get away with it, but should I try?

What if, somehow, they happened to have another of the same dress in the same size? Could I return mine and buy that one with the 25% off card?