The original sewist left her notes on the envelope front. Beginning at the top of the envelope, she wrote "For Jan - Dec '64". So, do you think the skirt was sewn for January - December 1964? Or do you think Jan is the person who got the skirts? In any case, the sewist goes on to describe what was sewn:
"Made blk herringbone - 25-1/2" waist
Took 3/4" seams on side
Fin lgth 24-1/2
3/4 yd - 54" enuf
Made blue skirt - 25-1/4" waist
The scraps: Two small snippets of wool in a herringbone weave were pinned to envelope. Here is the black fabric that she used, and the very pretty blue. Both are a comfortable, light weight wool. Yum, classic fabric for classic skirts! Looking at the pattern can you visualize the skirts in these fabrics?