By Real Simple
Updated September 23, 2009
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Ann Taylor dress
Credit: John Lawton

You already know that black is slimming, but this LBD provides additional benefits: diagonal draping to carve out a waistline and a substantial (not T-shirt–thin) wool-blend jersey that won’t reveal every lump and bump on your body.
To buy: Ann Taylor dress, $145, anntaylor.com.