women's black off the shoulder dress A Line Formal in bra ensures a flawless fit for any special occasion ABYOVRT Women Sexy Mini Dress

Avoid wearing bright colors

The collar style is formal, typically a wingtip or a formal spread collar, in contrast to the standard button-down or point collars found on regular dress shirts

A-Line Halter Wedding Dress with Silver Beading A modern take on a traditional silhouette, you'll instantly fall in love with this A-line halter wedding dress with silver beading from Stella York

Upon returning your item, you will receive credit to your boohoo account or as a voucher

Debretts, the British etiquette guide, still says that "for most people, this is the most formal dress code they will ever encounter"

Functional Thigh-High Slit: A precision-cut opening designed to allow for controlled movement without compromising the garment's formal alignment