I doubt you'll get much response if asking what you should do, for obvious liability reasons. Better to ask what other people do, listen to a range of experience, and then decide for yourself.
I'll answer the latter question, in my case. When I melted aluminum, in quantities of under 5 lbs, I did so on a 8" bore charcoal furnace. I always wore an arc welders helmet with clear glass when actually pouring, welding gloves, and a heavy shirt, or jacket if cold, and leather work boots.
I wear considerably more now that I pour iron from a waste oil furnace. Charcoal is much safer than liquid or gas fuels, and aluminum is much lower temp pour than iron. I now wear a full length leather shop apron, leather welders snap on boot covers, and a welding cape, besides the arc welders helmet, and welders gloves.
I don't wear aluminized gear -- the amount of radiant heat generated is shielded well enough by the leather gear, for me. This isn't a commercial foundry.
But for spills or splatters, leather will not hold up long if iron lands on it. My philosophy is that it has nowhere to stay on with my outfit -- it should roll off of what I am wearing before it has a chance to penetrate. All seams overlap, like roof shingles.
Boots without boot covers are capable of trapping metal on the tongue. The boot protectors cover that up with a smooth leather surface. They aren't expensive -- something like ten bucks. If I'd known about them back when I was just pouring aluminum, I probably would have worn them -- I think foot damage is the most likely danger from a spill, and face shielding is essential for splatters. The hands need radiant protection, but welders gloves seem adequate to me for that.
Again, you have to decide for yourself what is adequate for you. This is just what I do.