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When considering underthings for nighttime, the challenge is making sure that your choices stay invisible. "You don't want to plan an evening in a killer dress only to discover at the last minute that you have nothing to wear under it," says Nordstrom's Sandra Saffle. Be prepared with a convertible bra that adapts to all necklines, including strapless, plus a few lightweight shapewear pieces to address any excess.
Above: This smoky mauve lace bra dips low, so it won't show under the scoop-neck dress she's about to zip up.