I remember when I was first issued with NBC gear when I was staioned in Germany. It was probably around 1970 - and the first time this stuff had ever been issued. The pants and top were made of a charcoal-impregnated material which I seem to recall was part grey and part green. We were given two sets. One was to be used for exercise and the other set kept in the event of hostilities. When the packets were opened it was an absolute nightmare trying to open up the the suit. All the material was stuck together. The gas-masks had the cannister on the rleft side and were totally useles for someone like me who is cack-handed (left handed for our american cousins).
Don't open the packets!