For those of us in the space ops world, the memories of flightsuits are still fresh. Though I completely supported space folks switching to ABUs, I still miss what was the best "uniform" I've ever worn.
First, the myriad patch options significantly boosted morale; the distinctive unit nametags and morale patches that straddled good order and discipline just make it a fun uniform.
Second, the number of pockets, all in the best locations, is something the ABU will never come close to. Why yes, I do have a pocket just for my coin and chapstick.
Third, white socks.
Fourth, easy access.
Fifth, Velcro straps are ideally suited for the consumption of large meals and large quantities of beverage.
Sixth, the flight cap is a superior cover for wearing shades.
The one down-side of the flightsuit is that the material was specially designed with one way flow properties that allow no heat to escape in the summer, and frigid air/wind to penetrate in the winter.
Basically what I am saying is that people realize just how much better the flightsuit is than their uniform, and that can be tough. But at the end of the day, if you want to wear a flightsuit, do a job that wears flightsuits. If you want to grow a beard and wear Merrells, sign up for special forces. If your uniform is ABUs, STFU and wear your ABUs.