When it comes to choosing a color combination for a formal dress, it ultimately depends on your personal style, skin tone, and the occasion you’ll be attending. That being said, there are a few classic color combinations that are generally considered suitable for formal events:

1. Black and White: This timeless combination is elegant and sophisticated. A black dress with white accents or vice versa can create a striking look.
2. Navy Blue and Gold: Navy blue is a versatile and flattering color, and pairing it with gold accents or accessories adds a touch of luxury and refinement.
3. Burgundy and Champagne: Deep burgundy hues paired with soft champagne or cream tones can create a regal and opulent look, especially for evening events.