Tall samurai helmet by Traditional

Diagrams in NOA Magazine 93
Diagrams in NOA Magazine 156
Diagrams in Origami Twelve Days of Christmas: And Santa, too! by John Montroll
Diagrams in NOA Magazine 11
Diagrams in Origami Yearbook - Spring by Kawai Toyoaki
Diagrams in Doctor's Origami Dream Book by Toshikazu Kawasaki
Folded from a square of Earthtone Metals origami paper

Magic hat by Federico Scalambra

Diagrams in Origami Semplici ma non Facil - Simple but not Easy Origami - QQM 46 by Federico Scalambra
Folded from a rectangle of origami paper

Tall cap by Traditional

Diagrams in Easy Origami (Toyo 1) by Makoto Yamaguchi
Diagrams in NOA Magazine 189
Diagrams in NOA Magazine 458
Diagrams in NOA Magazine 542
Diagrams in NOA Magazine 589
Diagrams in Origami Decorations for Halloween
Diagrams in Beginning Origami by Vicente Palacios
Diagrams in Origami Text in 4 Languages
Diagrams in Origami Dokuhon I by Akira Yoshizawa
Diagrams in Easy Origami by John Montroll
Folded from a square of origami paper

Tricorn by Traditional

Diagrams in NOA Magazine 458
Diagrams in NOA Magazine 542
Diagrams in NOA Magazine 589
Diagrams in Origami Decorations for Halloween
Diagrams in Origami Text in 4 Languages
Diagrams in Beginning Origami by Vicente Palacios
Diagrams in NOA Magazine 189
Diagrams in Origami de Christmas
Diagrams in Easy Origami (Toyo 1) by Makoto Yamaguchi
Folded from a square of origami paper

Printer's cap by Adolfo Cerceda

Diagrams in Beginning Origami by Vicente Palacios
Diagrams in Fascinating Origami - 101 models by Vicente Palacios

Pussyhat by Beth Johnson

Folded from a rectangle of copy paper

Samurai helmet by Hamada Isamu

Diagrams in Tanteidan 17th convention
Folded from a square of origami-foil paper

Samurai helmet by Jun Maekawa

Diagrams in Genuine Japanese Origami (Book 1) by Jun Maekawa
Diagrams in Genuine Origami Square-Root 2 by Jun Maekawa
Folded from a rectangle of scrapbooking paper

Samurai helmet by Jun Maekawa

Diagrams in Genuine Origami by Jun Maekawa
Diagrams in Viva! Origami by Kunihiko Kasahara
Folded from a square of duo pearl origami paper

Samurai helmet by Makoto Yamaguchi

Diagrams in Origami Tanteidan Magazine 144
Diagrams in The Beauty of Origami by Makoto Yamaguchi
Folded from a square of duo origami paper