Most ammo pouches are pre-made, well, ammo pouches, we get them at military surplus or hunting supply stores. There are several on here that are hand made. As far as material, leather or canvas ae prefferable, although I have seen woven nylon. The biggest thing is that they are rigid enough to hold their shape. Vests kind of fall under the same constraints, I used imitation leather backed with canvas to give it strength. your best bet for a vest is to make it yourself, or have one made for you, there are not a lot of really good retail options. You are allowed to use a two-piece suit, as long as the two parts combined give the appearance of a one piece suit. Hope that helps.