Game of Thrones-style swag stolen from Melbourne theatre company

Police hope someone knows more than Jon Snow about the theft of a swag of Game of Thrones-style costumes in Melbourne.

Three full suits of armour, 11 prop swords and three inquisition hats are among the items stolen from Heatherton's Cloc Musical Theatre Company.

Several thieves broke into the venue sometime between 6pm last Thursday and 9am on Friday, police say.