I went to a headwear workshop in our local shire long enough to take a class in knitted flat caps. So far I have only knitted up my swatch and fulled it.. Hoping to have some free time to knit one up over the winter. I'll try to add a pic of the swatch later.
I am using the Patons Classic Merino Wool in a dark (charcoal) gray color)
http://www.patonsyarns.com/product.php?LGC=classicwool&SPP=999