White Embellished Dresses Oh Polly UK Cassis Embellished Plunge Neck Mini Dress in Black Oh Polly Melanie Plunging Neckline Embellished Mini Dress Purple Thats So Plus Size Plunging Neckline Mini Dresses. Step into the party in style with the Melanie Dress! This mini dress features a halter neck and a plunging neckline, creating a stunning silhouette. The open back adds a touch of allure, while the rhinestone detailing adds a touch of glamour. This is the perfect dress for your birthday celebration, just add heels and your favorite little shoulder bag! FABRICATION: 95% Nylon 5% Elastane SIZING: Holly's height is 156cm 5'1 and wears a size AU 6 US 2.