ASANOHA(Hemp leaf)Navy colour/麻の葉文（あさのはもん）紺色

A hexagonal pattern based on the hemp leaf, repeated as hexagonal stars.

Composed of horizontal, vertical, and diagonal lines, the hemp leaf stars can be linked together in allover patterns.

Source Traditional Japanese Patterns and Motifs

Asa-No-ha, as a pattern is one of the most popular patterns in Japanese culture, often seen on Japanese Kimonos and textiles. It is also found on the clothing of Buddhist statuary of the Heian (794–1185) through Muromachi (1336–1573) periods when the pattern was used for Kirikane ornaments. The design was also popular during the Edo period (1603–1868), when it was promoted by Iwai Hanshirou V.

Beliefs: Because, the hemp plant was known to grow rapidly and straight, the αsa-no-ha pattern was often added in children’s garments to encourage their healthy growth. Also the wives of merchants used to wear cloths with Asa-no-ha patterns to bring good fortune to the wearer.

Source http://www.textileartsnow.com/2014/07/the-japanese-pattern-asa-no-ha-and-how.html

It was often used as a motif on items for babies, as “[p]arents hoped that infants wearing it would develop with the vigor and toughness of the hemp plant.

Source http://www.immortalgeisha.com/wiki/index.php?title=Asanoha