Apart from my original 1968-issue Mk9 flying suit and a later Mk14A, neither of which were on my clothing card and were in any case obsolete, the only item I asked to keep was a pair of combat highs. Great for walking to Waitrose in the winter when the roads were too dangerous.
Then a couple of years ago I wore them to AeroExpo at Sywell, having been advised that the car parking field and exhibition area were rather muddy. But the wretched things disintegrated - large chunks of the soles fell out. I gather that this is not an uncommon phenomenon with combat highs of that era - perhaps that's why I was allowed to keep them?
But why do flying suits shrink in wardrobes?