What a stylish sisterly duo Sienna and Savannah Miller make! The Miller girls were out in force yesterday at the launch of their Twenty8Twelve line at UK department store Selfridges. Being the best advertisement for their own brand, they mixed a monochrome palette like true fashion pros. Savannah opted for the clean cut combo of noir et blanc, wearing a louche cut menswear inspired suit, teamed with a simple white shirt. Sienna on the other hand stayed in shades of grey, layering thick opaques under a pair of tailored charcoal shorts with a slouchy dove grey sweater. We don't like creating competition between sisters but if you reeeally had to choose, which of the Millers would get your best dressed vote?