There are numerous ways to customize your appearance in Call of Duty multiplayer. You can customize the look of your face and body with different races and genders available in the Faces section of the Dossier in the multiplayer menu. You can also equip special helmets, which you’ll earn from completing the single player campaign, zombies mode, or having participated in the Call of Duty WW2 Beta. Alongside these customization options you can also unlock completely new uniforms by calling in Supply Drops in Headquarters.
Each Division also gives you a unique customization option for your appearance. Each Division, the Infantry, Airborne, Mountain, Armored, and Expeditionary have a standard issue uniform that is different from the other. While the Infantry and Airborne are somewhat similar, the Armored, Expeditionary, and Mountain are all much different from one another.
Equipping outfits that you’ve unlocked via Supply Drops or purchased with Armory Credits can be done in the game’s Division select screen where you can press Y or Triangle to select “Personalize” while hovering over your Division logo.
You can find out more about all of the Epic Uniforms in Call of Duty WW2 here.