An abbreviated quote from Stockingshq.com regarding the views of their G5 crew:
"Our pilots are qualified on just about anything that flies. Both have previous military experience and our captain flew for Pan Am for many years. I asked him yesterday if he was familiar with any restriction or recommendation by the NTSB, the FAA or any other agency against women wearing nylons in flight. My wife wears nylons exclusively. He said he was completely unaware of any such warning and he added that if the inside of the plane ever got hot enough to melt nylon, fashion would not be our first concern. Good ole Jack! What a kidder!"
That said, I'm with A_A, and surely nylon (and similar) socks et al have been banned for military aircrew since time imemorial.
Jack