In the mid to late 90's I was asked to make some leather guitar straps for AC/DC. Here you can see Angus Young wearing one of them. The strap was made of two layers of leather with padding in between, a transmitter pocket down the bottom back and velcro leather tabs running back up for the aerial wire. More than twenty five of the same straps went out to AC/DC and they are still using them now in 2015.
Please let me know what length of strap you want, measuring from peg hole to peg hole, otherwise the strap comes at a standard length of approximately 50 inches hole to hole.