First, you can start a cap or hat from top to bottom, which means you would start by forming a circle. Once you have reached the desired diameter according to the formula shown below, simply extend the circle without enlarging. This is such a fun crochet pattern that many of my readers have asked some great questions about crochet hats. I made this hat last year with Color Made Easy – Shade for a person who can’t find hats that are big enough. To know how long to crochet, measure the distance between the eyebrows and the top of the head.