-safety glasses, especially those industrial types with side shields
-gloves .... welder's gloves are too heavy and bulky for fine work, and casting CAN be "fine work" Good leather work gloves that allow some dexterity will serve much better.
-long sleeves on shirts, full-length pants of natural materials.... jeans are a good example
-NO open-top boots, flip-flops, Crocs or anything else that would allow molten alloy a clear shot at your feet
The leather apron is a VERY good idea, available cheaply from HarborFreight etc.... maybe the best and cheapest insurance you will ever buy.
These points are based on (
ONLY FORTY FOR ME ) years and hundreds of thousands bullets cast from my moulds. Some recommendations come from hard experience.