All my patterns use US terminology.

This hat comes in 2 sizes

Measurements of the hat in the instructions

Adult: Hat height 23 cm (9 inches)
Hat circumference 53 cm (20.8 inches)
Kid: Hat height 23 cm (9 inches)
Hat circumference 48 cm (18.8 inches)

You’re going to create a very elastic fabric so the given measurements can be easily adjusted according to your
needs.

I’m giving to you the average sizes’ measurements but you can decide to adjust the size up or down appropriately.

Increase / decrease the number of rows for a wider / tighter hat.

You’re working in rows. This means that every time you finish a row you have to turn your work.