You can earn Gold by winning fights in Weapon Master mode. You get different amounts of Gold per fight. When you have earned enough Gold press Start and choose Shop. Here you can buy weapons. Be careful, each areas shops sell different weapons, outfits, etc.
The cheapest costume you can buy is for Astaroth. It's for sale in Altair (Chapter 5) and costs 17000 Gold.
Also worth noting if your saving up your gold for the weapon achievement then simply dashboard the game after your achievement has popped, you won't get to keep the costume but you will get your gold back :)
Posted by
WhiskeyWarriors on 12 May 14 21:15:12