I feel like they could do this by expanding the Accesory system to work in instances

Things like the Glasses and wings already work in combat on the overworld, so they could try expanding this to make them work in-instances and give us new accesories

To name a few off the top of my head, a Gleaner backpack, masks, waist-hanging pouches or bags

And a my dream that is waaaay more unlikely is them adding a "Body paint" layer on the character creation, for things like stockings, socks or tatoos that you apply directly on top of the skin texture