The pattern is here
and the gauge is 21 sts/ 29 rows per 4" in stockinette on size
4.5mm needles. I have some wool that I can achieve the same gauge
using a size 4 mm so I assumed it would be ok. My only concern was if
the drape would be different but I thought maybe since it used wool
originally and I plan to also use wool it wouldn't matter so much.
Thanks everyone for your help!