The Camouflage Costume is a retired costume that was first released in December 2005 in Account Upgrades and has been sold at the Smuggler ever since. A new version of the costume was released in February 2017. Camouflage pets - as the name suggests - use the common camouflage: green, brown, and beige. The old Camouflage pets had army hats, as camouflage is commonly associated with the army.
Camouflage Pets
Link: https://www.marapets.com/petcolours.php?do=colours&id=Camouflage