While much of the talk started out with foot wear, to that I will add I wear cotton and rag wool socks in my wooden shoes all year round. It really is cooler in summer and warmer in the winter. When others complain about cold concrete floors, my feet many times appear to be steaming when I kick of the wooden shoes. I do put irons on the bottoms to keep from wearing out the soles, otherwise they would only last about 8 months.
Next up the body is cotton work pants for warm weather and jeans in cooler, bibs in the winter over the work pants.
Next is my knee length leather apron with strap that connects the neck strap to the waist strap. It puts the weight of the apron on the shoulders and not the neck. The apron is split in the legs with straps and buckles to keep the legs where they belong. Makes it a lot easier for holding tools between my legs.
I wear long sleeve cotton shirts all year round. I started doing this when I switched to gas, helps to keep some hair on your arms and deflect sparks from burning your arms.
I always wear safety glasses with side shields, I need corrective lenses anyways, but won't let anyone work in my shop without safety glasses. Sometimes I wear goggles, and frequently a shield when grinding.
I really like 18th. century style work hats, 100% natural fibers again, frequently wool and linen. Helps keep hat sparks out of the hair, etc. and easy to throw the face shield or welding helmet over with not fuss, or turning a hat around. Plus they really do a much better job of keeping the sweat out of my eyes than any other hat or bandanna.
I frequently wear a left glove, occasionally one on the right (hammer) hand. Normally cheap welding gloves. I have tried Kevlar, etc, and find the cheap welding gloves work as well and cost a lot less.