Size
Only one size given in pattern, this is intended to be a sort of one-size “sloppy joe” sweater. But the shaping and patterns are simple and could easily be adapted for smaller or larger sizes. The sleeves especially are rather short (I like them that way) so you may wish to work more rows for them.
Materials
Pure cotton would work for this, but perhaps result in rather a heavy garment. So I have preferred a cotton/synthetic mix.
I especially liked the shades of grey and piunk used here, but it could be made in a single colour, or of course in bright contrasts.

For garment and size shown, I used 2 x 50g each of Drops Cottonlight pale grey, dark grey, and grape (dark purple, 4 x 50g of Cottonlight light purple (pink) and 3 x 50g Sirdar Calico (mid grey).