I have just finished this in 3.5mm leather. I made it similar to one ordered but made the top loop too short for a Sauer.
It's, as I said 3.5mm thick veg tanned leather. 2 1/2" wide with one inch long ends - cut from the same strip along the entire length, not attached in any way other than how nature made it. The adjustable thumb loop goes through a 3/4 inch retainer and is itself one inch wide. I've just minced about the house with it and it is comfy - but will be much more so when worn in a bit.
All the buckles are hand rivetted on and solid brass, they'll tarnish and lose their shine, but will last for years.
I've finished the whole thing in mink oil before assembly so it's all over it.
It's taken me all day and considerable amounts of materials to do this so I'd like £65 PLUS postage for it please, a steal, I feel, if this is your thing.
Thanks for looking