Where do you get the apron in club penguin?

To get an goldsmith apron you have to be a ninja you have to be a ninja because when you first walk in the ninja hideout there will be a book in the bottom right corner click it and turn the pages until you find the goldsmith apron that apron is 100 coin's other aprons are the coffee and Pizza aprons those two come out in either November or December in the giftshop.The last apron is the ice cream apron.