This is a pattern for a granny square top.

With given yarn , hook and pattern the top will be about 41,5 cm wide and 43 cm long
(laying flat from strap attaching point to lowest tip) for size M.
Different measurements are written under every round if applicable.

I used Perfect Cotton (100% cotton) - 4 ply - for hook sizes 2,5 - 3,5 mm - 100g
skein with ca 250 m of yarn
Size M takes about 230 grams of yarn

Every round has a picture to explain and visualize the pattern better.