This was my most hated trophy out of all the trophies in this game because it is the most /tedious/ one to get.
In order to unlock the Ultimate Fashion item (the Golden Soft Serve, found under items in the kings wardrobe - which is the red beads), you must buy all the other wardrobe items.
Afterwards the king will announce something new has popped up in the store (of the Fashionista will? either way, it'll trigger). The item costs 76,500 candy. Yes. 76,500 candy.
Because this price is absolutely ridiculous, it will take an awful lot of grinding or day jumping in order to accumulate the correct amount of candy to buy it.