I'm looking at a few belly band holsters.

Gunner Security offers two versions: MB1 - Fits small frame guns: 22, 25 caliber automatics and MB2 - Fits medium/large frame guns: .380s, compact 9mm, .40 and .45 autos, 2-3" barrel revolvers. How in the world am I going to carry my little Taurus 85 revolver in the same pocket that my full size Colt 1911 is supposed to fit? Or am I misunderstanding the range of sizes included?

Why doesn't Magills offer different sizes for different guns?

Is there a difference in quality of construction or materials that should be obvious to me? Or a particular type of material I should be looking for? (The first smarty to say "stretchy" gets popped on the head with my carrot stick or current snack of choice.)