Back in the 60's I made my own clothes for high school and college. Most of the fabric came from the basement of JCPenneys. If I remember right, 79 cents a yard was a typical price.
Sears and Montgomery Wards also sold fabric. I remember buying 24 yards of flannels to make baby clothes in 1969. The flannel was on sale at Wards for 33 cents a yard. For $8 I made enough baby things to last through that baby and the next two.