Two bodies mean two ways of showing off your style!
You can't be twins though.
To customize your characters go to the Locker -> Appearance
Outfit, face styling, hair, and facial accessory, are unique to each character, they can only be equipped on one character at a time.
Additional character skins can be purchased in the Store.
Character skins include an outfit and, depending on their rarity, can include additional customization items such as tattoos, facial accessories or hair. You can mix and match parts of different skins to create your own unique look.
Character skins come in different rarities: Prestige, Masterpiece and Heirloom.
Masterpiece and Heirloom skins may also offer alteration options that can be unlocked with Fame (XP) or Spectre Points.