Daniela from On The Cutting Floor shares a free pattern at We All Sew for this reversible wool hat. The hat has flaps to keep your ears warm. Use a wool fabric for the outside for warmth, and a soft fabric like flannel for a soft lining.
Click below for the free pattern and tutorial:
DIY Reversible Wool Hat, by On The Cutting Floor
[photo from On The Cutting Floor on We All Sew]