Although sometimes prohibitively expensive, Joel and Sons, London, stock a polyamide tulle which is quite robust with limited stretch @ £11.90 per metre, (
www.joelandsonfabrics.com). Maculloch and Wallis, London, stocks a polyester sports mesh (heavyweight) @ £12.77 excl.vat. The latter also stocks a soft crin that also looks quite useful.(
www.maculloch-wallis.co.uk).