It's worth mentioning what to
combine with nomex - this is important
My received wisdom is to wear fabrics that
don't melt. All the nomex in the world is no use if your polyester tee underneath fuses with your skin. Ouch!
I use cotton, denim or wool. Wool is flame resistant but scratchy
Cotton is neither, but burns quickly, and won't melt; denim is cotton but thick so a little better. I like wool for base layers, I use it on the mountainside too.
Finally - leather jackets are nice but cost the earth!