Note: I took this design from Origami: The complete guide to the art of paper folding by Rick Beech and I take no credit for the design of the piece.
Step 1: First Fold
Then take ONE sheet and fold it up to the previous fold.
Double this over.
Step 2: Secure the Rim of the Hat.
Fold edges to the centre.
Fold remaining sheet at the bottom to the previous fold.
Unfold and fold corners up (see pic).
Pull up as far as will go and tuck in.
Step 3: First Hat!
Open out and place atop your head :-)
First hat completed!!
Step 4: Second Hat!
Fold in corners and tuck them into the rim of the hat.
Open up the rim and fold edges into box shape.
Second hat completed!