Transmog items are permeant and set up to auto add to your inventory, assuming your chara can use the item. In some cases the item will not add because your chara can’t not transmog the item into something else. But typically, once you pick up the item, you’ll see blue text within the item screen saying you haven’t collected this appearance yet. so even if you sold it or deleted it afterward, it will still show up in your collections list. I know I don’t like all the clutter either.
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