When you’re off to the premiere of a movie about Vogue (aka “The September Issue”), you had better be on your best fashion behavior. Luckily Sienna Miller passed the test with flying colors in her darling sky blue Thakoon frock paired with a woven metallic Bottega Veneta clutch. It’s simple, but unabashedly feminine and undoubtedly designer-savvy. Surely Anna would approve.

Photo from InStyle.com.

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