This is the Vivienne Westwood t-shirt that Twitter user princess katie's mom bought her. She bought it because she thought it "was just cool patterns", but Katie discovered is actually a massive orgy. It sounds like somebody needs to pay a trip to the optometrist. And that person is Katie, because all I see are cool patterns. Get your mind out of the gutter, Katie, your mom bought you a nice shirt to wear to school.
Keep going for several more shots including Katie wearing the shirt, as well as a product shot of the entire shirt so you can clearly see the dogs boning. You can buy the shirt (which is actually a men's t-shirt) online for around $50 - $80 (although everywhere I checked was quickly selling out), and I looked at the official Vivienne Westwood website and they sell some t-shirts for $400+. Clearly, I'm in the wrong business (I should be a cruise ship masseuse).
Thanks to Demetri, who knows what I like, and I like cartoon naked people doing the nasty.