The Aba is a super easy party silhouette to dress up or down or somewhere in between. (Proof: Ann claims she's worn it to three or four weddings herself.) There's a hook-and-eye closure at the top of the neck, which can give it a slightly different look when you wear it closed vs. open, plus elasticated cuffs and a chic, optional self-tie belt. This one is made up in a very beautiful, very special lamé — created with a heat-transfer process that gives the fabric a fantastic texture. All of the shimmer, none of the scratchiness.