Cap by Traditional

Diagrams in NOA Magazine 152
Diagrams in Origami Paperfolding for Fun by Eric Kenneway
Diagrams in Paper Folding for Beginners by Murray and Rigney
Folded from a square of origami paper

Policeman's hat by Traditional

Diagrams in Essential Origami by Steve and Megumi Biddle
Diagrams in NOA Magazine 157
Diagrams in Pajarita Extra 1984 - Art in Your Hand by Carlos Pomaron Arbues
Diagrams in Japanese Origami for Beginners by Vanda Battaglia and Francesco Decio
Diagrams in NOA Magazine 9
Diagrams in Origami Hats by Sergei Afonkin
Folded from a square of origami paper

The Captain's Hat - story by Traditional

Diagrams in Beginning Origami by Vicente Palacios
Diagrams in World's Best Origami by Nick Robinson
Diagrams in NOA Magazine 129
Diagrams in Chinese Paper Folding for Beginners by Maying Soong
Diagrams in Complete Origami by Eric Kenneway
Diagrams in Festive Folding by Paul Jackson
Diagrams in Origami Decorations for Halloween
Diagrams in Pajarita Magazine 1
Diagrams in Papiroflexia by Eduardo Clemente
Diagrams in Pajarita Especial 1983 - Primavera
Diagrams in Origami - The Complete Guide to the Art of Paperfolding by Rick Beech
Diagrams in The New Origami by Steve and Megumi Biddle
Folded from a rectangle of origami paper

Samurai helmet by Traditional

Diagrams in Chinese Paper Folding for Beginners by Maying Soong
Diagrams in NOA Magazine 177
Diagrams in NOA Magazine 188
Diagrams in NOA Magazine 189
Diagrams in Origami 1-2-3 by David Petty
Diagrams in Origami in English by Makoto Yamaguchi
Diagrams in Origami Magic by Florence Temko
Diagrams in Teach Yourself Origami by John Montroll
Diagrams in Beginner Origami by Yoshihide Momotani
Diagrams in Complete Origami by David Mitchell
Diagrams in Creative Life with Creative Origami 1 by Toshie Takahama
Diagrams in Cute Animal Origami by Makoto Yamaguchi
Diagrams in Doctor's Origami Dream Book by Toshikazu Kawasaki
Diagrams in Double-sided origami by Taichiro Hasegawa
Diagrams in Easy Origami by John Montroll
Diagrams in Ecuador Origami Convention 2014
Diagrams in Enjoy Origami in English (Joy of Origami!) by Satoshi Takagi
Diagrams in Essential Origami by Steve and Megumi Biddle
Diagrams in Everyone Can Learn Origami by Peter Saydak
Diagrams in Everything Origami by Matthew Gardiner
Diagrams in Four Seasons Origami Encyclopedia by Makoto Yamaguchi
Diagrams in Fun Origami World by Makoto Yamaguchi
Diagrams in Hands-On Origami by Raul Rosado
Diagrams in How to Fold Origami by David Mitchell
Diagrams in Japanese Origami for Beginners by Vanda Battaglia and Francesco Decio
Diagrams in Japan's Creative Origami by Kawai Toyoaki
Diagrams in La Fisarmonica - QQM 2
Diagrams in NOA Magazine 11
Diagrams in NOA Magazine 22
Diagrams in NOA Magazine 153
Diagrams in NOA Magazine 156
Diagrams in NOA Magazine 333
Diagrams in Origami - The Complete Guide to the Art of Paperfolding by Rick Beech
Diagrams in Origami (Bolitho) by Mark Bolitho
Diagrams in Origami 1 by Robert Harbin
Diagrams in Origami 2 by Ondrej E. Cibulka
Diagrams in Origami Fantasy by Takuji Sugimura
Diagrams in Origami for Children by Mari Ono and Roshin Ono
Diagrams in Origami Instruction Book by Miyajima Noboru
Diagrams in Origami Text in 4 Languages
Diagrams in Origami Yearbook - Spring by Kawai Toyoaki
Diagrams in Pajarita Especial 1985 - Pliar 85
Diagrams in Pajarita Extra 1984 - Art in Your Hand by Carlos Pomaron Arbues
Diagrams in The A to Z of Origami in English by Makoto Yamaguchi
Folded from a square of duo Chiyogami paper

Nurse cap by Traditional

Diagrams in Origami A-B-C by David Petty
Diagrams in La Fisarmonica - QQM 2
Diagrams in The Joy of Origami by Margaret Van Sicklen
Diagrams in Origami Hats by Sergei Afonkin
Folded from a square of origami paper

Hat by Traditional

Diagrams in Essential Origami by Steve and Megumi Biddle
Diagrams in Pajarita Especial 1983 - Primavera
Diagrams in Pajarita Magazine 7
Diagrams in Origami from Around the World by Vicente Palacios
Folded from a square of origami paper

Dunce hat by Traditional

Diagrams in NOA Magazine 20
Folded from a square of origami paper

Hat by Traditional

Diagrams in Origami Hats by Sergei Afonkin
Folded from a square of origami paper

Hat by Traditional

Diagrams in Origami Journal (Russian) 14 1998 4
Folded from a square of origami paper

Japanese helmet by Matsuno Yukihiko

Diagrams in NOA Magazine 393