Best Bet: Banana Republic’s Issa Wrap Dress

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It's no coincidence that this frock bears a striking resemblance to Kate Middleton's famous sapphire-blue engagement dress. This jersey dress is part of the limited-edition Banana Republic Issa London Collection, which re-creates items from one of K-Mid's favorite British brands at a more affordable price. Its simple waist tie and three-quarter-length sleeves makes for a polished look at end-of-summer soirees and well into fall. Considering that the original sold out within hours after its appearance on Kate, we suggest that you make a swift transaction.

Royal Blue Wrap-Tie Dress, $130 at bananarepublic.com.