I'm going to try again with fingering weight yarn.
The pattern itself is knit in 2 pieces (front and back), not one piece as I originally thought. It's 2x2 ribbing at the top, with an eyelet row halfway through the ribbing, to thread a ribbon through. The pants are knit in garter stitch. So pretty easy, mindless knitting.
Off to see what fingering weight yarn I haven't packed up yet!
ETA: Found some "Diana" sock yarn from Yarn Love. Color is "Early Crocus", which is purple/pink/yellow/white variegated. Will try this yarn, may make endless rows of garter stitch more fun: