Reference article
Alien Outfit
The Alien Outfit combines Alien Head and Alien Cloak into a complete look in 
Duck Life: Space.
Getting the outfit
Buy 
Alien Head and 
Alien Cloak at 
Mars Shop for 50 
Coins each. Equip both pieces on the same duck through duck selection.
Wearing the outfit
The hat covers the head, and the costume covers the body. Wear them together for the full outfit, or mix either piece with other clothing. Clothing does not improve racing skills.