I don't wear a vest, and part of that is just what this is all about. I don't want to jangle.
I switched over a decade ago from a vest to . . . well, let's face it: it's a purse.
The technical term for it is a messenger bag. I take it off when I sit down. The flap opens up and gives me a nice dry spot for putting my calls. I used to be able to tell you a sure place to buy the exact model I have, but now the best I can do is point you towards Amazon.com and tell you to search "Everest Camo Messenger bag" Figure $10-$12.
Additionally, I have a musette bag for the big bulky stuff like the dekes, the rain suit and the lunch.