l'agence dress Serita Maxi V-Neck Bias in Champagne and perfectly cut denim have earned the brand a devoted following of A L'AGENCE Karma Sequin Maxi Dress

For birthday girl Maddy, she chooses a slip dress from Marc Jacobs collaboration with Devon Lee Carlson for her big day

This pattern is compatible with the D-I-Y (Design-It-Yourself) range of sleeve extensions

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'We sold out within the first 30 minutes of sale and have since restocked all colours and sizes.' The dress, in black and blue, is also for sale on Amazon, and Depop, and user comments have been just as amusing