I was looking for a pair of pants I know I have in the wardrobe to add to my avatar, and they were not showing up. I searched for the item in Account Search and it confirmed that I have them in my wardrobe. I went back to the wardrobe and tried searching "All Items" instead of "Owned Items," and the pants came up! When I select them, the item preview on the avatar base does say "owned," rather than giving me the shop search link to buy them, so it looks like the item is there... it just doesn't show up when I am searching only "Owned Items" in the wardrobe.

(I noticed that other items also seem to be missing, because I was originally searching "Delish" in the Bottoms layer, and I know I have a bunch of Delish sets but only 3 items showed up; I only confirmed the one particular pair of pants I was looking for, but I would imagine the results would be the same with other owned items that aren't showing up.)

Did you confirm that the "Drawer" selection was showing "all items"?

The only times I've not had items show up (that are definitely in the wardrobe), its been because I had a drawer selected without realizing it, when an item has just been added (sometimes it can take the cache a while to process) or the item ended up being in an unexpected layer.

I just tested my Delish items and they all showed up. Checked bottom and chest layers.

Yes, I confirmed the drawer selection was showing all items. Still having this problem.