Outdoor use/camping-hiking.....
If the main use(s) of the holster will be for hiking or field use, Id say the best choice would be a Bianchi Intl UM92II in black or OD. The M12 holster could work too. You might find one at a army/navy shop or gun show bin.
The UM92II can be worn with a flap or without. You can add a thumb snap. You can wear the pistol on your leg(SAS or drop leg style), tanker(chest) or shoulder. The holsters are easy to clean(I used liquid laundry soap or hand soap).
The front of the M12/UM92II has a cleaning rod too to help clean any obstructions/cleaning in the field.
Rusty