Cotton shorts or sweatpants and a ratty old black t-shirt (chosen mostly so I don't act as a fill-in reflector during printing!). A nitrile or vinyl glove on one hand for handling prints during processing, which I can deal with one-handed at the sizes I print now.

No goggles, just my glasses. As a related aside: I remember in school us 4-eyed folks always being exempt from wearing the big safety goggles in high school chemistry and wood/metal working classes because "our eyes were already covered". I'm sure OSHA/HSE would get all grumpy cat about that these days, so that might not be normal any more. But, the practice stuck with me.