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

Double Denim Double denim, also known as the Canadian Tuxedo, was a significant trend in the 90s

The sweetheart neckline provides a flattering shape, while the spaghetti straps offer a delicate, modern twist on the traditional ball gown style

White: A white dress for 40th birthday exudes elegance and fresh sophistication

Best shoe pairings: Silver stilettos or rhinestone heels Gold or rose gold metallics Black patent for contrast For your royal blue prom gown, silver or rhinestone shoes are timeless, while black stilettos give an edgy, dramatic twist