I have a fishing vest I wear on long road trips. When you go through a drive through, toll booth, etc. it’s easier to have your wallet in your chest or stomach area than to try and fish it out of a pants pocket while in the driver’s seat. Similarly, cell phone in the breast pocket, smokes, lighter, etc.
I wear a fishing vest when working out in the field to carry bits and pieces for my work, first-aid kit, extra snacks, water bottle, emergency blanket, flint and steel, etc. I wouldn’t like to spend a rainy night out in the woods, but I could. I sort of forget about it until I go into a gas station or store and they ask me “How’s the fishing?”