The thinker set is a cosmetic outfit that is partially given to the player by Daffyd once they have caught one of each impling. The robes and trousers will be given, but the boots and gloves must be obtained by looting crystal implings in Prifddinas. The complete outfit can be added to the fancy dress box in a costume room of a player-owned house. After 4 September 2017, the gloves and boots could also be received rarely from the Motherlode Maw.
Despite the destroying message of the robes and trousers players can talk to Daffyd to get those outfit pieces back by choosing the option: "I've lost my 'thinker' outfit." Players cannot get the gloves and boots back this way.
A male player wearing the thinker set.
A female player wearing the thinker set.