You're over 40 -- you're not dead. You've still got energy, sex appeal and interest in the night life. Timeless colors like black and navy complement your timelessness. But you need more support in some areas, and support bras and spaghetti straps don't harmonize. For evening wear, look for dresses and tops with straps wide enough to conceal your bra. If necessary, buy new foundations to suit your after-hours wardrobe.
Accessorize just enough. You'll shine plenty without piling on your entire collection of jewelry. Select two or three spectacular pieces to complement your dress.
Use a similar high impact minimalism with your makeup. Choose one feature to be the star for the evening. Play up your lips with red lipstick, or make your eyes dramatic, but don't put a spotlight on every part of your face.