formal dress lace Long Sequin-Print Prom with Lace-Up Open Back Hot Pink / 6 print evening gowns for prom. A Line 2025 Burgundy Lace

At its simplest, cocktail attire calls for a semi-formal suited outfit in a darker color either grey or navy with dress shoes and a tie, as Brian has styled here

Generally speaking, the longer the dress, the more formal the affair

Pair this dark elegant dress with some dark elegant accessories, like this black crystal necklace and earrings set, plus statement midnight plum lipstick if you dare

If you need to avoid eggs, I haven't found a great egg-free version that holds the same texture, but some readers have had luck with vegan mayo.

If you're unsure what business casual means at your workplace, observe how your colleagues dress or check your company's dress code policy for guidance