Sashiko — the Japanese art of decorative stitching — has many regional forms, but three stand out as its most celebrated: Tsugaru Kogin-zashi, Nambu Hishi-zashi, and Shōnai Sashiko.

Kogin-zashi and Hishi-zashi share the same fundamental technique: counting the threads of the cloth and building geometric patterns stitch by stitch. Both originated in northern Aomori Prefecture, where farmers had access only to hemp — a fiber that provided little warmth on its own. By layering dense stitching across hemp cloth, women created garments that were both more durable and better at retaining heat. The stitching was not decoration; it was survival.

Shōnai Sashiko, from the Sea of Japan coast, developed differently. That region had access to second-hand cotton clothing traded down from Kyoto and Osaka, so Shōnai stitchers worked to reinforce used cloth rather than transform hemp from scratch — a different constraint that shaped a different aesthetic.

The roots of sashiko itself run deep: stitching techniques similar to Shōnai’s appear in records from the Asuka era (7th century). But Kogin-zashi and Hishi-zashi evolved into something distinctly their own, found nowhere else in Japan.

Tsugaru Kogin-zashi

Kogin-zashi developed in the Tsugaru domain — the western half of present-day Aomori Prefecture — during the Edo period (1603–1868). Under strict sumptuary laws, farmers were forbidden from wearing cotton or silk. Hemp was the only option, and kogin stitching transformed it into something wearable through cold northern winters.

The word “kogin” (小巾) originally referred to a short hemp work garment. Garments reinforced with sashiko were called sashi-kogin, which over time was simply shortened to kogin.

Kogin-zashi is built on a single structural principle: stitching threads horizontally across the full width of the cloth, counting an odd number of warp threads for each stitch. This produces the diamond-shaped patterns — called modoco — that give kogin-zashi its characteristic appearance. The patterns are arranged across the cloth in bold, symmetrical compositions. The aspect ratio of the cloth grid is 1:1.

Three regional styles

Depending on the region within the Tsugaru domain, kogin-zashi developed three distinct styles:

West Kogin (west of Hirosaki, toward Meya)

Characterized by alternating black and white threads on the shoulders, creating horizontal stripes. This reinforced the fabric where heavy loads were carried. The stitching tended toward finer, more formal work, and horizontal stripe patterns incorporating the sakasakobu motif were common — stitched, according to local belief, as protection against vipers in the mountain villages.

East Kogin (east of Hirosaki, toward Kuroishi)

Coarser cloth, thicker thread, simpler compositions. Fewer modoco types, with a more restrained and geometric sensibility.

Mishima Kogin (around Kanagi, Goshogawara)

The rarest of the three. In this area, crop failures were frequent, leaving little time or material for extensive stitching. What survives is distinctive: bold thick lines of three horizontal stripes in white and black running across the upper chest and back from the shoulders.

History of Kogin-zashi

In the Meiji era, the sumptuary laws were lifted, and cotton cloth became widely available. Because cotton threads slide more easily through cloth than hemp, and because cotton retained heat far better, the original reason for kogin-zashi — to make hemp bearable — disappeared almost overnight. By around 1895 (Meiji 28), the practice had nearly vanished.

Its revival came in the early Showa era, when folkcraft scholar Sōetsu Yanagi encountered kogin-zashi through a student from Aomori and became fascinated. His research culminated in a landmark article published in the journal Kōgei (No. 14, 1932), bringing kogin-zashi to national attention. The Hirosaki Kogin Promotion Society was established in 1943, and a folk art boom in the 1960s brought new interest and a wider range of colors. Today, kogin-zashi is practiced by people all over Japan — and increasingly, around the world.

Nambu Hishi-zashi

Hishi-zashi developed in the Nambu domain — eastern Aomori Prefecture and the northern tip of Iwate Prefecture — though today it is found almost exclusively within Aomori. Its origins are estimated at around 200 years ago.

Where Tsugaru was relatively fertile, the Nambu region faced harsh agricultural conditions. Even after railways opened in the Meiji era and cotton cloth began arriving from the Kantō region, the material hardship of farmers improved only slowly. This scarcity is visible in the stitching itself: each kataco motif often uses different colors and thread types — evidence of women making use of every scrap of precious thread rather than wasting a single strand.

Hishi-zashi was applied primarily to aprons (maedare), kimono shoulders, thigh coverings (momohiki), and work gloves (tekko). It is said that aprons with hishi-zashi stitching were still in everyday use as recently as the early Showa era.

Structure of Hishi-zashi

Unlike kogin-zashi’s horizontal all-over stitching, hishi-zashi is built around the kataco: a diamond-shaped frame created by stacking stitches and shifting each row horizontally by two threads. Motifs are placed one by one inside these frames. The stitch count within each kataco is always an even number (unlike kogin-zashi’s odd counts), and the grid ratio is vertical:horizontal = 1:2, giving the patterns a slightly elongated appearance. There are more than 400 known kataco patterns, many with silhouettes suggesting curves or circles rather than sharp angles.

Kataco names come from the natural world and everyday life of the Nambu region — animals, plants, tools — preserved in the old dialect of Tsugaru to this day.

Two traditions, one technique

Kogin-zashi is well documented, with older surviving examples and a continuous tradition of regional preservation since the early Showa era. Hishi-zashi is less widely known — sometimes mistakenly described as a variety of kogin-zashi — but has been quietly maintained by local practitioners, and its pattern repertoire of 400+ types is remarkable.

The historical relationship between the two is not fully understood. Both developed independently in the same prefecture from similar material constraints, yet arrived at visually distinct results. That mystery is part of what makes them worth studying.

Both can be enjoyed today with the same materials and basic technique, which is why koginbank covers them together.