J.A.
I have used gabions in this application (we used “river rounds” because they are a locally available resource).
The wire in the gabion panels is pretty stiff and would be limited to large curves (unless you have it molded to shape in a machine shop), but I have made round columns using thinner guage meshes (aka agricultural livestock fencing, hardware cloth etc). The nice thing about curvalinear design is the stability of the shape means you don’t need as much tensile strength in the mesh–just strong enough not to bulge or sag. You can even counteract this by placing a hollow structure (if a column, use pvc pipe for instance) in the center to remove some of the pressure.
Mark