I didn’t make the gauge, because it will fit someone anyhow. Easy to crochet, with the chart to follow.
Ended up to have a diameter of 21 cm.

I already crocheted other hats of this book. Here is the link:
http://www.ravelry.com/projects/Liatorino/beanie

Here another hat from this book (’Hippy Chic’ on page 20):
http://www.ravelry.com/projects/alimitchell/flower-croche...
and on photo 3 the one I crocheted, with hook 3 and hook 3,5.

On photo 4+5: another street smart beret with yarn leftovers…The scarf is crocheted without a specific pattern, crocheting around a central yellow bord using the yarn leftover I had (= circa 137 cm long). On the top of this second beret I added a brown surface border too.