The majority of flame retardant fabrics are treated with fire resistant agents. When it burns, it will release strong odor and heavy smoke, which is also not environmental friendly.
The one which is inherently fire resistant is seaweed fabric. It burns with light smoke without odor. The fabric will self extinguish when it is away from flame.
Besides, the seaweed fabric is also anti bacterial, skin moisturizing and emf shielding, etc. The raw material seaweed is sustainable kelp from ocean without any pesticide in cultivation.