Make a free basic pattern of a bandana in stockinette stitch. It is a knitted triangle with a rolling edge and no frills - but you are free to add all the frills you wish.
The bandana measures approx. 90 cm at the widest part of the triangle - and for children approx. 75 cm.
Give your gauge in number of stitches per 10 cm horizontally and number of rows per 10cm vertically. The pattern and the estimated yarn needed is based on the gauge. You have the option to only give the horizontal gauge then the yarn estimation is based on an expected vertical gauge.