Limited Outfits?
It sounds like that item was a town clothes. If memory serves, when they revamped the wardrobe system all the past town clothes were converted over to tonics and there was an option to get a refund at that time. He can ask for a refund but iirc there was about a month allowed for that and it’s past.
I don’t know why they didn’t send out new costumes to those who purchased the old town clothes. Perhaps it’s because they don’t track purchases made with gold bought gems, since those don’t bring them an income. They annoyed a lot of people with this and if they sent out costumes to some but not others, then there would have been an even greater uproar so they decided to annoy people equally, rather than some more than others.