Try theatre fabric suppliers as they have a consise range of fabrics all DFR and IFR(durable and inherantly fire retarded). They also have "wide" fabrics not just 1.5m wide. Shark tooth gauzes are great. Hard wearing and come in many different grades(thickness's and mesh sizes). They are more expensive than high street fabrics but you dont need to piss around fire retarding them yourself. Also some fire retardents leave stains on fabrics which tend to show up when lit.
If you are in uk then jc joel www.jcjoel.co.uk
are great. They have some very interesting IFR PUFC fabrics ( strong, waterproof and very white )
As a foot note to all VJ's "get fire retarded screens". I have seen a crap screen go up in flames recently with dripping plastic falling from the sky. It is out responability to follow saftey rules and not cut corners to save a few quid/bucks.