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Black is a strong neutral that can hold its ground against a red dress without stealing the show. Wear a thin black belt around your waist to break up the monotony of a solid red smock dress. Finish the look with black tights and black knee-high boots. Black can look strong and classy, but the right black accessories can really turn up the heat. Wrap a black lace shawl around your shoulders for an evening look. Carry a matching black clutch with lacy accents. Complete the look with your highest pair of black stilettos or heeled boots. Pairing red with white works really well for casual and retro looks. Give your red summer sundress a retro vibe by wearing white bangle bracelets and white sandals. White sneakers can look great with the right casual red dress, too.  For a 50s pinup vibe, try wearing your red dress with strappy or open-toed white heels.  Tone down a red dress at the office by wearing it with a soft white cardigan. Patterns create added visual interest, but a simple black and white pattern keeps it subtle. Try a black and white polka dot handbag for timeless appeal, or get a little edgy with a large zebra print shoulder bag. Flats with black and white stripes can look great, too. A simple pearl necklace, matched with small pearl earrings, can create a classy, elegant look, especially when paired with a white or cream shoe. Add a pearl cocktail ring for even more glam. To create a 20s look, drape a long string of pearls over the front of the dress, or double the string up for a flapper vibe. A simple necklace or tennis bracelet adorned with black stones is a good way to add a small trace of black to your outfit. Black diamonds are also popular now, although they are on the pricier side. For a unique yet sophisticated look, wear black pearls.

Summary:
Break things up with a black belt and shoes. Use black to add a little sexiness to your outfit. Lighten things up with white accessories. Try a black and white pattern. Pull out your vintage pearls to add simple sophistication. Choose jewelry with black gemstones like onyx, or even black pearls.