This is a one size pattern to fit most adults due to the all over ribbing.

Knit in the round.
Using approx. 100g aran weight yarn.
3mm and 3.5mm circular needles needed.
22.5sts x 33Rs = 4 x 4 ins swatched in the round in stocking stitch.

This pattern is untested, I am not a pattern designer, just sharing for fun :)