Per the reg for the G-1:What are the naval officer designators that are allowed to wear the leather flight jacket, or that you've seen wearing a flight jacket? Obviously NA, NFO. What about AMDO, AEDO, flight surgeon, SUPPO's assigned to aviation unit, Intel O's assigned to aviation unit, 63XX LDO's, etc.?
"Naval aviators, pilots, flight officers, undergraduate pilots, NFOs, and flight surgeons, aerospace experimental psychologists, and aerospace physiologists"
Then again, it also says you can't wear Nomex with khakis . . .
As for Nomex, it doesn't say. I have a family member who's a 1520 and has Nomex ones from his squadron days, and they seem pretty common in pictures from ships underway. If the 1520s do it,, I imagine the LDOs and CWOs do.