When I was in ninth grade, my junior high school band played a medley of 
songs from Oklahoma.
It was our theme for the concert and we were suppose to dress up in western 
garb.
So my Mother took me to J.C. Penney's to buy a pair of blue jeans.
Blue jeans were just work clothes back then, they hadn't started to catch on 
yet as a popular style.
Anyway, there was only one pair left and they were a little too big but we 
bought them anyway.
I remember the salesman saying that there weren't many jeans around because 
the government was buying up all that material for the military.
It's the only "war time shortage" I remember encountering during the Vietnam 
War era.