I can't find that option in the new wardrobe, but I may be looking in the wrong place.
In the +11 years I've been here, I've never heard of such an option. O.o

unfortunately not.
the previous 'organize wardrobe' page had different sorting options for your items, one of which was user price so you could quickly see the most valuable things in there. there was also a column that displayed user price. it was very convenient but probably yet another thing that made that version of the wardrobe unsustainable.
If you make a Subetalodge account, you can import your wardrobe items and sort them by price from there. Unfortunately, it's a few extra clicks if you want to also look at the previews of items to decide if you want things or not, but it might help?