Once in-game, you can find the dress in the menu of the Atom (character) you are customizing.
: Short for "variant," the standard file format used by Virt-A-Mate to package models, clothing, and scenes. How to Use the Piece
You can often find and download these types of community-created assets on the Virt-A-Mate Hub (VaM Hub) , which serves as the primary repository for the game's mods and digital pieces.