I have finished my first ever top-down sock and started the second. I tried to knit one once as my first sock and could not get my head around the heel flap and gusset instructions. Since then my knitting skill has levelled up a LOT and I have knit many many different typed of toe-up socks albeit with short-row heel, heel-flap and/or gusset and so when I saw this pattern mentioned on a knitting video podcast (The Knit Girllls) I decided that I would give it a try with some left over Wendy Happy light-fingering sock yarn, even though the pattern (free, via ravelry, “Skyp Socks”) called for sport-weight yarn (a yarn weight I have yet to find for sale in a LYS in the UK.
Maybe that is what we call 6 ply? We call fingering-weight / sock-weight yarn “4 ply”, whatever spinning ply the yarn actually is.