Even when working with stained glass I tell all my potential students no exposed feet (no sandles, flip flops, open toe shoes, etc.) because molten solder gives a nasty burn. I also advise against shorts for the same reason.

When my students ask why I wear kilts I remind them that I also always wear high kilt socks so my exposed skin is actually quite small. And once I put on my workshop apron, even my knees are covered.