Here's something I've just put together in response to some emails I've received with regards to modelling straps and buckles. Hopefully this will be of use to some of your figure, AFV and of course S&M projects (not that I'm working on one at the moment.. :P )
Eduard photo-etched mesh.
Remove a square from the mesh.
Straighten the sides by filing it against a needle file.
Straps could be made from recycled 3M Post-it notes.
Attach buckle with superglue.
Create the bulging strap in the center of the buckle.
Stiffen the paper with oil/lacquer-based varnish. It could be lightly sanded with a grit-400 sandpaper to remove any paper fibres when the varnish has set.
The finished result.