Steve, unfortunately all marking is washed out so I don´t know the date.
For this smock exist removeable hood. I have never heard about hats or trousers. Also in the book Výsadkáři a průzkumníci československé a české armády 1945-1999 you can find only the smock.
Raff, yes this is mine. Few years ago I sent you a pic of it, do you remember?
There is a big difference between mraky and sumpftarn pattern smock. The "sumpf" is the top of my top list of top things I want to get a hold of