They're probably selling it cheaper there, and no one's worn it yet. I can't tell you how many times friends, jealous of my 'just pennies a day' wardrobe, ask me to take them to the store with me, only to get all sad and mopey when they can't find anything they like. Rome wasn't built in a day, and neither was my closet. Sometimes you strike out, and you have to accept that. Come back in a week or two.
New stuff is put out every day, and there's high turnover.
Well, except for the bridesmaid dresses, which languish in eternal limbo. At this price, its very tempting to avoid the nasty medieval changerooms altogether and just cross your fingers. But a wasted 5 or ten bucks could be spent on something more exciting, like bingo, or a nice hunk of havarti. So try it on. I've learned this the hard way, as my storage space full of Rubbermaid Storage Totes can attest to.