Thanks CYHeli -that was all I could come up with on my own too! Was wondering if there were other, more esoteric reasons for the 2-piece I hadn't considered ;-)
Great pix BTW and I reckon it's tremendous to see professional pilots looking professional in uniform. A pox on the juvenile muppets that apparently get their jollies denigrating people that don't conform to their warped world-view here. Keep it up!