It would have been nice if Anna shared her solution to us!
For everybody who found this page in the search results, here is the solution that works with all clothes that use "Maitreya Alpha Auto-Hide V5.0.0.9".
Wear the item to fix,
set the alphas in the Lara hud to your liking,
say in local chat: /95 part-of-itemname menu,
in the menu choose Get Alpha,
and then Finalize.
It is also possible to delete it. For details see the Maitreya help page at the end.
https://sl-maitreya.blogspot.com/p/alpha-auto-hide.html