Cast on 25 stitches
knit in ribbing for 1.5 inches
added 2 stitches every 5 rows 4 times knit 1.5 more ribbing cast off loosely in ribbing
Sew seam
repeat for second legging
I chose not to knit in the round as I think having a seam up the back allows the leggings to 'stay up' as opposed to scrunching down.
Used sport weight 100% merino washable yarn