It is amazing how what used to be bad is now about to be good again. Years ago the US Army used a two piece flight uniform made of nomex. They "improved' it by going to the one piece "green bag" similar to that which the US Air Force used. Now is seems the Air Force wants to "develop" a two piece flight uniform. Why not 'reinvent' what we already have information on?
https://www.military.com/daily-news/2019/04/19/air-force-experimenting-two-piece-flight-suits-pilots-aircrew.html
https://www.military.com/daily-news/2019/04/19/air-force-experimenting-two-piece-flight-suits-pilots-aircrew.html