Newspaper hats, or boats.
How to make an origami hat - origami snapback (Henry Phạm)
How to make an origami sun hat (http://www.origami-make.org/origami-hat-sun.php)
How to DIY Beautiful Origami Rose #craft #Origami
Pirate Hat Guide, from wikiHow
kabuto for kodomo no hi.
Origami Crown- Easy Paper Craft For Kids. Simple Japanese paper folding, suitable for kindergarteners or early elementary. Great for fine motor development!
Useful how to make an origami hat - http://www.ikuzoorigami.com/useful-how-to-make-an-origami-hat/
How to make a traditional origami cap: page 1