1911a1 series holsters; brands...
John Moses Browning's 100 year old warhorse has many US fans & active users.
Depending on your budget, likes & uses, there are many top 1911a1 holsters you can obtain.
Check out these popular US makers; Don Hume, Safariland, Blackhawk, El Paso Saddlery, Mitch Rosen, Milt Sparks, Bulman Gunleather, Greg Kramer/Kramer Gunleather, Bianchi-intl, Alessi, Blade-Tech, COM Holsters, Highnoon Holsters.
Many gun owners like horsehide & exotic skins. A regular polymer or Kydex rig from COM, Blade-Tech or the Blackhawk SERPA could work fine for general wear. The milspec/NATO Bianchi M92 series nylon holster could do well for field/outdoor use. The SERPA is decent for added security. The regular open style is great too.
Please know that many custom shops can take months to fill orders. Quality takes time.