The Prince outfit is a set of clothes that is composed of a prince tunic and prince leggings. The outfit cannot be traded to other players or sold to general stores.
Male players can acquire this outfit by trading a frog token (from the Frogs random event) to Thessalia of Thessalia's Fine Clothes. It should be noted that only a male character may wear the prince outfit. If gender is changed whilst wearing it (going to the Makeover Mage) then the outfit will change into a princess outfit, the female equivalent, which is obtained in the same way.
The Frogs event is available to both free-to-play and pay-to-play players. Players whose character is female will receive a princess outfit instead.
See also
Trivia
Before the random event update, a player could trade in a frog token for the entire prince outfit (the prince tunic and the prince leggings). Now, with the random event gift box, a player can only receive one piece of this costume each time he/she receives the random event.