I'll confess, I love unlocking cosmetics. I've spent a decent amount of money on them. Fashion is a big deal. But one of the worst mistakes I made was purchasing a bundle pack that gave me a ton of hairstyles from the base game and the same for body markings.
I am using an add-on to help alleviate this, but it has its limitations.
A simple way to do this would be to allow us to mark collectibles with a Shape/Color system. Something simple that lets you assign a shape and a color to any collectible by selecting the shape/color from a drop down menu on top, right clicking on a collectible and assigning it. Then allow us to filter based on those two variables. You'd probably only need 5 shapes and colors, but it wouldn't be difficult to do more.
This way I could, for example say only show me things marked "Blue" or "Circle" or "Blue AND Circle." Or whatever colors and shapes you pick. I don't care. We just need some organization.