Luckily the climate here allows me to be barefoot
Apart from my steel-caps I wear when doing some work, and my hiking boots I wear...well when I'm hiking, I haven't worn shoes in maybe 10 years.
I gave a talk about photography in a club in January this year, I had to go and buy some shoes because the club had dress rules 
I suppose that technically I do have a solar-powered welder, it's a small 24v MIG that runs off the truck batteries that in turn are charged by solar.
Rob