Ok let me explain.

If you go to any leather/Hobby shop they will either be able to sell you strap material by the yard or, as Sten Rune and I have done buy an un cut section of hide for belts and, a strap cutter.

Then you can cut the strap\belt to the width you want . To make the edge just apply warm water on a cloth and pull the strap though your damp cloth a few times very hard.

then you'll nedd a buckle two clips and some rivets which are all readily available.

In fact the tools we use are from the USA so it shouldn't be too difficult to equip yourselves with the basic's

Good luck ...and really it's not difficult