The Old Costume is a retired costume that was a part of a December 2005 Account Upgrade; Ian had made it available again through Smuggling for a 400 Dukka Coin. Putting this costume on certain pets will make your pet old! Old pets are gray, brown and sometimes blue and have elderly people's accessories (hat, rags, glasses, scarf, and walker).
Ball of Old YarnEdit
The only minipet that can be Old as of now is a Silkie.