I submitted this as a bug report in game then realized they don't respond to those but I kind of do need a response for this.

Anyways, I made a pair of True Linen Trousers of Striking for a friend, part of a whole set. When I was done, I put all the gear in my retainer. I should note that my bag was pretty messy, so I just clicked on all the green icons. When he was ready to get it all I again clicked on every green icon on my retainer to withdraw the items and traded them over.

The issue is, as he pointed out, the pants are missing. They don't show up in my inventory or any retainer with the item search, or in his. I have no idea when they may have gone missing - if they were never put in my bag after the craft was finished, if they disappeared in my retainer, or if they disappeared in trade, because I wasn't paying much attention to the icons.

Either way, the item is missing and nowhere to be found. I did not delete it, nor did I accidentally list them for sale or sell them to a vendor. Same for him. I realize they're not hard for me to make, but I'd like to figure out what happened to them and get them back if possible.