The twin, 21, complemented her baggy, multi-colored kimono-style dress with... a chunky velvet headband.
Check out Mary-Kate's other questionable fashion choices here.
POLLTell Us: What do you think of Mary-Kate Olsen's headband?
Tres Chic! Call the FashionPolice!
Lara's Wardrobe Cam
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Photos: Hot list of sexy and savvy Brits
Challenge: Who's That Star?
Who's the best dressed celebrity?

Cate Blanchett
Gwyneth Paltrow
Heidi Klum
Kate Hudson
Jessica Parker