SPANX Get Moving Black Square Neck Dress Size XL Size XL, new without tags The Get Moving Square Neck Dress is ready for pickleball courts and more! Designed with Booty Boost® fabric and a built-in bodysuit that’s super easy to get on and off, this style offers opacity, targeted shaping and a held-in feel. We didn’t forget the necessities – we designed this collection with a hidden pocket that secures your keys, credit card, and phone.​