This is a major bug that can impact a lot of people.

I accidentally deleted clothing that was part of my saved outfits, because it was under the "Available" tab instead of the "In-use" tab in the Inventory.

My suggestion is that if clothing is part of a saved outfit, put it under "in-use" tab even if the avatar is not currently wearing it. Those outfits are saved for a reason, meaning they were meant to be kept, to be able to change into them in the future.

When cleaning out the 'available' tab to get rid of excess inventory, I accidentally thought a scart that I got as a free prize was awarded to me again, so I deleted it out from the available tab. To my shock, I went to go put that outfit back on, and most of my clothes and accessories are missing in the saved outfits now. Also, they are no longer available in stores for me to try to buy them back.

Please consider making clothing or accessories in saved outfits show up under "in-use" tab.