6 shrinking shirts

I recently joined a volunteer building program in which me and my wife volunteer 48 hours a week to on a permanent basis. I recently purchased 6 new oak ridge golf shirts from mr price for use on the construction site. The shirts fitted amazingly well in store and I was very happy with them. However after cold washing them ( I only have cold connected to the machine) all 6 shirts have shunk to the point where they are unwearable! Since I don't work secularly this waste of money is completely unafforadable for me. I would really appreciate it if this could be resolved