Buy or make boxes that will fit into the shelves like drawers. You could fit 2 on each shelf, side by side and put a "U" shaped groove on the top rim so you can pull it out easily. That way, you can sort and carry the stash easily and even label the boxes according to colour or design etc.
I solved mine by buying wire baskets that stacked up inside the wardrobe. That way, I didn't have to hire a carpenter to make shelves in the hanging space.