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If you think dressing for your office holiday party is tricky, try figuring out what to wear to a White House gala honoring your ex-boyfriend (a.k.a. The President of the United States). On tonight’s new episode of ABC’s hit drama Scandal, Olivia Pope (Kerry Washington) prepares to walk the line at Fitz’s 50th birthday bash and, we promise, some BIG surprises are in store! InStyle.com caught up with the show’s costume designer, Lyn Paolo for the skinny on the Jean Fares Couture gown she and Washington chose to perfectly suit the occasion. “Kerry and I wanted to find something as wonderful and stylish as the Calvin Klein vintage gown she wore last season,” Paolo said. “After much searching we found this vintage Fares gown, which did everything we needed it to do.” Read: wow the President while still allowing Olivia to glide through the night solving problems. “It is stunning, in Olivia Pope’s color palette and it moved beautifully on the body. It was just the perfect gown for this exciting next episode,” Paolo said. Tune in tonight at 10 p.m. EST to see the gown in action as things reach a climax on Scandal.

Plus, see more about Scandal!

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• Olivia Pope’s Spy Inspired Outfit
• More Scandal Fashion Details!
• Abby’s Evolving Scandal Wardrobe

— Angela Salazar