I agree that the shop is messy and could due with some way to sort.
I also think the character equip and trade UI is just as bad. For example, there is no visual info that says you are limited to 3 accessories. I know its been done in all other RPG's, but the diagram of a person with slots and indicators on what is what (by text or a line pointing to the diagram of the person) really is a good quick way to see what is equipped and how much of each item can be equipped at one time. Sorry, didn't mean to get off topic...