Made these as a christmas gift for my step-mom.
For bottoms used two strands and stated needle size. for the tops and the strap, I used one strand and size 17 needles.
Lopi felts well, but the bottoms just didn’t get small enough. Kathie said they fit fine, but I wanted them to felt a little smaller. I know from my own, that they stretch a bit with time so it’s better to be a tad too small.