All furnitue must comply to a standard (I forget the number now) THe easy otion for furniture manufacturers is to use fabrics that don’t burn too well under the ignition source. This does not mean they will not burn if the temperature around them is high enough and they will usually give off more toxic fumes when they do.
Wool does not sustain a fire very well by itself but will ignite easily and if there is another heat souce it burns very well. Wool is usually blended with Poly or other syntehtics.
I used to work with non-toxic fire retardants the problem with them is getting them to bond long term with fabric as they are usually salts and tend to be easily removed from fabric.
Is the problem a lack of “naturally” flame-resistant fabrics, or is it cheaper to use a polyester then dose it with retardant?
I’m trying to see where the problem is.
I get involved in some “fire art” projects and polyester is definitely out, but wool is generally considered OK. Bare skin is preferred because skin is difficult to light. Polyester will turn you into a torch.