I have a homemade blue denim. It was made by my seamstress cousin for her brothers when they owned their own business. The reason I like it is it has 2 side pockets, 1 micrometer flap pocket so it does not fall out when you need to bend over. It also has 3 other small pockets for pens, rule, scribe or whatever. I have nylon parachute rope to tie it over the shoulder. I have a number of others, but this is by far my favorite. I use an apron whenever I remember, that is, because it is more productive when warn. I keep a small square, bubble level and maybe a part I'm working on in the side pockets. I'm not trying to look professional I just don't want to be looking for stuff when I'm working on a project.
Paul