I'm figuring the 70s but I was hoping for maybe just a Little bit earlier? lol I think it very likely it's polyester.
The fabric and manufacturer's label on yours do look late 1960's to early 70's to me, however I found this photo from 1994 which shows exactly the same style of uniform: Auxiliary of VFW 4929 on Memorial Day in 1994. Courtesy of V.F.W. 4929 http://twinsburg200.com/galleries/vfw-post-4929/
