This is a pattern for a simple but effective scarf or wrap, which can be worked with many yarns and needle-sizes.

Instructions are given for yarn in sport weight and a button with 3,5 cm in diameter.

Errata:
Corrected instructions for buttonhole:

next row: k11, BO7, k until end of row; next row: k52, CO7, k11

Thanks to crepereia for the italian translation, which also can be found here.

And thanks to Quito to Ana (HilosyLanas) for the spanish version.