Knitted neck straps?

I am sure it is possible, but use a durable material that won't flex/ stretch a lot. It will also need some sort of adjustment mechanism and a good solid hook to hold the horn. You can search around for average weights of different saxes...I think tenors tend to range from 7.5-8.5 pounds.

You might just make something great and become an innovator in the saxophone strap world. Who knows?