The main pattern is seed stitch and garter stitch
Seed stitch gauge is 13 stitches * 24 rows (1010 cm/ 44 inch)
It is written in 3 sizes. S, M, L
It works from bottom to top. You can use any color you want.

I did a size S crochet. For the main rectangle, I use one-row single crochet and one-row double crochet. Front ribbing is single crochet. The same way to make it. I add buttons on the crochet one.