Denim is one of the most versatile materials around. If you can wear jeans to work, go for it! Start your day in dark jeans and a sweater. Before you leave the office, change into a fun top with some sequins on it. Add a pair of heels and some red lipstick to complete the nighttime look.

2. Use your Accessories

Accessorizing is really key in making a daytime look work for nighttime. One good idea is to keep a tote bag with some accessories - clutches, costume jewelry, a pair of black platform heels - in your car or office so that you can make anything into a cocktail party outfit.

Shoes

With shoes, the general rule is that fun, bright colors or dramatic heels or funky shapes will work best at night. Trade your low, black, sensible heels for red ones, and you've got the right idea. Replace your flats with platform heels, or go from a closed-toed work shoe to an open-toed stiletto for nighttime.

Belt

A belt can add a lot of personality to any outfit. If you're wearing a classic shift dress to the office, try adding a belt with some sparkle for your nighttime look. You can also add a wide belt to a cardigan and jeans, and it will completely transform the outfit.