black tea length cocktail dresses A-Line One-Shoulder Wedding Guest Tea-Length With Ruffles Stormy Blue shop1556 Silhouette Elegant Black Tea Length Dress

stick to sophisticated silhouettes and luxurious fabrics, such as silk or velvet, to avoid looking underdressed (a big no-no for a black tie optional dress code!)

Of course, don't forget Insta-worthy drinkware for your guests to cheers you into 21 with

Yet, as fashion has democratized and lifestyle habits have changed, we have moved into an era where formality is defined by the quality of the garment rather than the amount of fabric used

Dont go overboard and descend into full costume wear here, of course, and remember that a little bit goes a long way

I hope you love this 1990s prom dress photo

The patterned frock is wrapped in a funky black-and-white design that's as polished as it is pretty