[qt:http://xxxxmagazine.tv/videos/mov/fashionweek/londonss2011/LFW_SS11_twenty8twelve-ipad.mov 640 360] TWENTY8TWELVE COLLECTION VIDEO Twenty8Twelve designers Savannah and sister, actress Sienna Miller, featured their spring/summer collection with a simple 50's Mexico inspiration. Strolling down the runway were very wearable simple summer dresses, cute ruffled full skirts, and shorts. There were a few leopard and floral print dresses and many of the models sported…