Very simple ancle socks that could easily be adjusted to full length socks by knitting the rib longer.
These socks are knit from the toe up, in
stockinette, with heel flap and gusset.

Sizes (foot circumference): 15, 17.5, 20, 22.5
Length is adjustable
Ease: at least 2cm negative ease
Gauge: 32sts/10cm
Yarn: any sock yarn with at least 400m/100g
Yarn amount needed: 30-60g
Needles: 2,5mm
Techniques: Magic loop, Judy’s magic cast on,
Jenny’s surprisingly stretchy bind off, German
short rows