I usually just roll with some pouches on my belt. However, if you were to go with a vest, I would button the first button on the bottom and the top of the jacket.. That way your ghillie (which I am guessing is jute/burlap tied on a jacket) will not flap around but you still can reach into the jacket to the vest to pull some mags out of each pouch.
With that said, the vest would be inside the ghillie jacket, but with the middle area unbottoned, getting mags, radios, etc. out will be fairly easy.
With that said, the vest would be inside the ghillie jacket, but with the middle area unbottoned, getting mags, radios, etc. out will be fairly easy.