a minor glitch(?) it seems, but I unlocked the lace skin from a subeautique purchase a while ago, and just now my next purchase has the event "You've unlocked the Lace Skin!" covering the top half of the page again. I didn't get a second achievement event, nor is it listed twice in the wardrobe, but it seems a tad strange? don't know if it happens on every purchase (only had the two tickets) but yeah. just seems a bit odd to have it pop up again if nothing actually happens? (I don't think?)

I am having the same issue, I think I unlocked this skin 3 or 4 times already. XD

yep, you can "unlock" this skin more than once. seems already having the skin does not preclude the event from happening, just like already having an active bumbus quest doesn't preclude you from continuing to get bumbus quest events.