satin dress pleated Women's Black One Shoulder Maxi Small Fitted Design Ayla Pleated Satin Gown -

The SKIMS mogul, who is famous for her own line of slinky dresses, poured herself into a skin-tight $4,000 gown by Alia to mingle with the likes of Eva Longoria and Meghan Markles mom Doria Ragland at the 4th annual This Is About Humanity Soire

Of course, don't forget Insta-worthy drinkware for your guests to cheers you into 21 with

The detachable long blouson sleeves can be worn on or off-the-shoulder, attaching at the softly scooped neckline and cuffing at the wrist with a subtle row of fabric-covered buttons

Getting professionally measured is the most reliable way to ensure the final product reaches you perfectly tailored