Mary Kate and Ashley Olsen: The masters of outfit matching since 1988. Take a look back at their 36 most memorable twin ensembles, from Full House to It-tweendom to The Row.

Mary Kate and Ashley Olsen: The masters of outfit matching since 1988. Take a look back at their 36 most memorable twin ensembles, from Full House to It-tweendom to The Row.

Mary-Kate and Ashley attend the 9th Annual Kids Choice Awards in all black and their favorite: floral.

Mary-Kate and Ashley attend the 9th Annual Kids Choice Awards in all black and their favorite: floral.

Happy 29th Birthday Mary-Kate and Ashley Olsen! Watch Them Sing and Celebrate in These Hilarious Throwback Clips http://www.people.com/people/article/0,,20929781,00.html

Happy 29th Birthday Mary-Kate and Ashley Olsen! Watch Them Sing and Celebrate in These Hilarious Throwback Clips http://www.people.com/people/article/0,,20929781,00.html

Celebrating Mary-Kate and Ashley Olsen's Retro Matchy-Matchy Style (Happy Birthday, Gals!)

Celebrating Mary-Kate and Ashley Olsen's Retro Matchy-Matchy Style (Happy Birthday, Gals!)

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