For any class specific armor you have to have the armor piece and a class doll. Dolls are summoned from gift boxes. Each class gets a color specific gift box.
To get a gift box:
1.Make a mask of melodies - red throne, crown, knight, squire
2. Combine mask with words of wealth to get 1 funny money.
3. Repeat steps 1 and 2.
4. Give 2 funny money to peachy and you receive a random colored gift box or a useless idol.
5. Gift boxes are no drop but they can summon 5 dolls of the specific class it is, that are tradeable. Best price i can get for a sham doll is 100k. Im not sure how in demand other classes are. Maybe others can speak to that. 1 mask will cost roughly 37k x2 =74k
The problem is if you have bad rng and get an idol, your out 74k. If you have a partner and do 2 turn ins, 148k. Better chance of getting a gift box. Sham gift box could be worth at least 300k at 60k a doll. Magician is like 15k a doll, so you there is risk involved.