Star Wars Jedi Fallen Order Mantis skin list will give you everything you need to know about all the Mantis skins in game.
Star Wars Jedi Fallen Order BD-1 Skins List will give a complete breakdown of all the unique collectibles cosmetics for BD1 in game. Each skin is found hidden in the game worlds many chests, except the default skin and pre order skins.
Star Wars Jedi Fallen Order Outfit list will give you all the details of all Outfits from the game. There are only a couple of outfits to get in fallen order but all are found in the game world.