Thanks PTT, I think most of us know the configuration of buttons and zips on a Norwegian jumper!
I believe the deveation instructions about the buttons on said article of clothing, were due to the way the buttons were sewn on, ie normally and not in the flying combats method.
And just because it will be worn under the flying suit does not make it safe. Thats why natural fibred clothing should be worn under it.
You wouldn't wear a pair of Ron Hills under your flying suit thinking it safe would you?.............would you?