During the 15 Days of Christmas in 2013, this item, along with other Christmas-themed equipment, were given the Hybrid style of combat, and stats that scaled with the player's levels. This was so players could use these items in combat to assist in hunting for festive crackers during the event.
When entering Port Phasmatys whilst wearing the robes you receive a message saying "The ghosts eye you suspiciously and realise you are masquerading as one of them."
This is one of the few tops in the game that is identical for males and females. Jagex have however claimed that this was to add to the "ghost-like" effect of the clothing and that if the clothing was gender-biased, it would lessen the effect.