Epic Games does not futureproof old unobtainable skins. It's not just Helsie but numerous other skins that are developing visual bugs with each patch. Images below is before vs after patches.

Heya /u/Honestly-Bored and thread - thank you for all the comments calling out individual Outfits you've noticed an issue with.

Our team is crawling through this thread to make sure we capture each one you've raised and making sure we are tracking towards a fix for each.

Keep 'em coming! and feel free to tag me in anything you're seeing that is particularly odd. Appreciate you all :)