I know. I was melting polyester and nylon into smelly little balls in high school home ec in the early 60’s.
That’s why I knew the Navy hadn’t consulted anyone who knew anything about man made fibers.
Even the Air Farce has half a brain on non-flammable uniforms. AFSC’s that deal with flammable material (fuel etc...) are issued fire retardent garments. When I deployed to Kuwait in 2007 I was issued comfy practical 100% ripstop cotton 3 color desert BDU’s instead of the absurdly heavy, hot, and flammable ABU.