Maybe this is a bit OCD, but i think it would be easier to find something in your arsenal if you are able to order it by drag and drop them in the place u wanted. Like, placing your high end swords on top of the list, or put the items with status effects one after another, or even be able to put the materials in order so u can find them with ease..
Is a thing of conveniance, really... But i think some people (like me) would feel more confortable.
There is already a search bar with partial match, and some ordering options (click the triangle icon). Choosing the same ordering option twice will toggle ascending/descending.
I don't know what more you can add to this interface without the feature being a duplicate or excessively OCD...