The holsters from Glock are fully engineered and very functional. Light weight and durable. They look very Glock-like. Which is to say unconventional and made from an engineered plastic. But they work great and they cost about $15.00. So go there first. If you like it--then you are done. If you don't like it you are not out much money. My bet is that you will like it.
People pooh-pooh these holsters because they are made from injection molded resin. But the resin and design was engineered by real molding engineers, and not designed by retired firemen, retired cops, or former saddle makers.