Window Shopping at UK Urban Outfitters Online

Recently, I've been seeing a few dresses and stuff I want from the UK Urban Outfitters site. But seriously, why are the things there so expensive? I'm not saying they cost as much as Prada, but I can't get around to justifying the clothes for what UO is charging.Take this Kimchi & Blue double layer tank top for instance, my sister got it last week in the States on sale for 15usd. And guess what?