Reference article
Ducklien Outfit
The Ducklien Outfit combines Ducklien and Ducklien into a complete look in 
Duck Life: Space.
Getting the outfit
Buy 
Ducklien and 
Ducklien at 
Pyro 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.