SIMONE ROCHA Black Puff Sleeve Taffeta Mini Dress
Size UK 8 US 4 (See Approximate measurements below from Net A Porter

Black mini dress is cut from taffeta with romantic puff sleeves juxtaposed against sporty buckled shoulder straps

Off-shoulder neckline with adjustable strap detail
Short puff sleeves
Gathered waist
Hidden zip at back
Ottoman slider straps on the shoulders, hanging on the back. Lined and closed at the back with an invisible zipper.

Approximate measurements (INCH)
BUST 30.7
SLEEVE 4.3
SHOULDER 12.2
WAIST 28.3
LENGTH 28.3