Use crafting mats from retainer.
I love the crafting system in this game and frankly I would craft all the time if not for the tedium of moving items between character and retainer every time I want to craft. I tend to put my crafting mats on my retainer/s but the issue with that is I gotta go fishing for them anytime I want to craft something.
Solution would be to make it so that we can use mats from the retainer without taking them off of the retainer and placing them back on the retainer everytime we want to go adventure. So like, the crafting window would recognize that you have the items if it sees them on your retainer.