If you like to put something on your head, why shouldn't it be old clothes?
I choose nice old fabrics from dresses, jackets, pants, or bathing suits, sometimes patterned, sometimes simple, sometimes I print them with my own patterns... anyway - I make caps out of it. For now 5-panel caps, which are even reversible, in case it gets too colourful sometimes... but there are more shapes to come... keep updated on Facebook!