black halter formal dress Sleeveless Applique Tulle Mermaid Dresses – Dbrbridal Maren is your go Rhode | Black Halter-Neck Midi

The asymmetric neckline and subtle side cutout bring a modern, elevated edge, while the flowing skirt creates a graceful, flattering finish

Powder Pink dusty rose Rosette rose gold English Rose NEW

Sheer dress and flat boots Getty Images If knee-high boots paired with a full-length hemline feels too wintry for now, a sheer midi-dress is the perfect alternative

Mix things up a bit with a formal-meets-fun look that you can put together in the time it takes to say, shots? Start with a snazzy print this lemur design is perfect layered over a crisp white T-shirt

Fully lined in stretch matte fabric for comfort and movement, this bodycon design is finished with a centre back split and invisible zip for ease and refinement

If you're looking to take a chill approach to your 21st birthday look, opt for a simple maxi skirt set with edgy cutouts