Historic Instructions state:
MATERIALS: Bear Brand or Bucilla Cassimere Sport Yarn, 2 balls, or Bear Brand or Bucilla Ladyfair Sweater and Stocking Yarn, 2 skeins.
1 set (5) Bucilla Steel Knitting Needles, Sock Size No. 11, Article 3494.
On needle size, please see the WW II Pattern FAQ, or simply use the modern-sized needles to achieve the proper gauge.

From the website:
“I used Nature Spun Sport Weight yarn, 4.5 ounces or 125 grams approximately. My gauge, on size 1 US needles, ended up being 8 stitches to the inch, rather than the 7 called for in the pattern.”