79-80 issue was two green flight suits. Didnt have more than two until months into my fleet squadron and that was only because they wanted to send new ones for everyone to be embroidered. More would have been nice. But really, how hard is it to throw them in the wash? Hell, in the fleet, guys wore the same flight suit for weeks, just hanging it in locker and walking away. On the boat, flying summers in the IO, had two flight suits. No one seemed to have more than 2 or 3. Kids!!
The actual issue number is "4," but one is an over-sized flight suit if you had/have the older dry suit, so you really only have 3 initially to wear, assuming you even get issued those. As a JO, I then got a tan one once I showed up at my fleet squadron, but only one. From there, it's up to the enterprising aviator to start collecting more while not playing the PR game of "you have to turn one in for every one issued."