I'd like to address the issue of binding fabric only. I still have in my collection some of these very fabrics, so I do wonder if some of them may be a bit less than 50 years old, more like 35-38 years old??
Nonetheless, other than the red circled fabrics below, which indicate the ones I am so familiar with, the light green and the light yellow are still available in Kona cottons from Kaufman. Several online shops carry them.
Also Connecting Threads carries solids that are similar to these solids in your quilt. They even carry some "ditsy" prints like the ones I circled, little tiny prints that look "old fashioned".
You won't have trouble finding something that will work very well for binding and be period correct for your lovely treasure.
Jan in VA