Popsugar Fashion Fashion Designers Mary-Kate and Ashley Olsen's Style Icon Mary-Kate and Ashley's 75-Year-Old Muse Is About to Become Your New Style Icon August 26, 2015 by Sarah Wasilak View On One Page Photo 17 of 22 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 17 She Rocks a Plaid Set Previous Next Start Slideshow Ashley OlsenMary-Kate OlsenFashion DesignersThe RowCelebrity DesignersFashion Instagrams