Lily James in Isa Arfen

Lily James in Isa Arfen. Photo courtesy of Moda Operandi.

Who: Lily James

Where: The Moda Operandi Holiday Dinner in London.

When: Tuesday, November 17th

What: A long-sleeved Isa Arfen top and skirt and chunky black sandals.

Why: As holiday party season approaches, the challenge appears to look festive, not cheesy. In a sparkly, yet subdued midi dress, James succeeds.