Furniture and clothes collections are difficult to sort through without previews of the items appearances on the collection screen, particularly with clothes which you have to remove and put on to remind yourself what they look like, and as items get added to the game even the collections (like weapons) which have item previews are going to get harder to look through to find one particular item.
For help sorting collections items, I'm thinking some sort of drop down menu, maybe? Items sorted into types, ie, open the weapons collection, open its drop down menu, select daggers and see all the daggers. Open the clothing collections, open its drop down menu, select robes and see all the robes, etc.