Concealment kit

Concealment kit is a mask one can make in the Hearts of Stone expansion. To do so, the player needs 3 things:
 * Ass ears: "won" by losing against the gwent players during Dead Man's Party
 * The Professor's spectacles: bought during the auction portion of Open Sesame!
 * The diagram: found at the caravan troupe northwest of Carsten. Look under the stairs going up to the stage for a hidden chest.