I use this:
headwaters® gunner’s vest
Recipient of the Platinum Mega Honored Favorite Game Vest Certificate of Universal Merit. Fully adjustable strap vest style means you can wear it on a hot quail hunt or frigid grouse hunt, layering underneath or not as needed. Plenty of room for gear -- water bottles to first aid kits -- and lots of birds, too. Adjustable straps, mesh pockets, water bottle holder. Made in USA.
adjustable front straps
separate water bottle holder
mesh pockets for empty shells or live birds
inner back pocket with blood-proof lining
1000 Denier Cordura and tough nylon mesh
Sizes: Medium/Large Extra Large
Color: Blaze Loden
Quantity:
UD 1587 $99
Once I bought one I have used nothing else. The big advantage is that you can use them in any weather. I don't know why more people don't use them. You can wear whatever you need to underneath. It is simple, smart, and it works.
Here's a link for the vendor that supplied the info:
https://www.uglydoghunting.com/vests_men.php
Uglydog is a great company to deal with as well.