Is it possible to get it to work with galacticcraft accessories? right now the thermal protection and oxygen accessories show even when the cosmetic armor is supposed to override.

Like any extended inventories, i will need to add specific code to deal with them, GalacticCraft's accessories is one of them.
I might add support for GalaticCraft in the furture just like the support i did for Baubles.
But with more and more extended inventories support i added, i will need to change things around to make it consistent.