ONI Denim ⭐ Top pick

An invisible craftsman, a weaver with 40 years beside him, and a nearly vanished machine. Secret Denim is not a product, it is a living technical secret. Oishi does not speak to the press, has no flashy website, and chooses retailers one by one. The denim speaks in his place.

Masao Oishi is not an outsider in Japanese denim, he is one of its founders. His father, Tetsuo Oishi, is the man who convinced Cone Mills to ship rolls of denim to Japan, enabling the first Big John jeans in 1967. Before that, the first Japanese selvedge denim used Canton Mills fabric, sold under the Canton name from 1965. Japanese denim is an Oishi family story.

Masao has worked in the industry for more than 60 years. He is famously discreet, almost never speaks to the press, and for a long time had neither a website nor public contact details. The ONI legend grew in that silence: a mysterious craftsman in Kojima making denim nobody else can reproduce.

Nobody can reproduce it, and that is the core of everything. Secret Denim, ONI's flagship fabric, was born from Oishi's attempt to recreate the warp yarns of the first Cone Mills denim imported to Japan. He dyed the weft yarns light beige, then beat them, trying to recreate the natural yarns Cone Mills used in the 1960s. The first results were promising, but Oishi wanted to go further.

He introduced thick slub yarns, irregular yarns that create texture, in both warp and weft, and dyed the weft a darker beige. The machine used to spin those slub yarns is virtually extinct, a forgotten technology Oishi brought back. That is the secret ingredient that makes Secret Denim impossible for other brands to reproduce: even a skilled weaver who replicated the loom setup could not recreate the yarns.

The weaver who makes Secret Denim has worked with Oishi for more than 40 years. It is a duo no brand in the world can duplicate: the designer's experience and the weaver's experience, accumulated over four decades of collaboration.

The result is 20oz denim, heavy and textured, with a blend of earthy beiges, sea-foam greens, and deep blues. Secret Denim does not produce the sharp whiskers or dramatic combs seen in high-contrast denim. It fades toward washed, soft, organic tones, like jeans worn for decades. Denimhunters writes that Moca Secret Denim (20th anniversary edition, brown weft) is 'the most stunning fabric ONI has ever produced.'

Among enthusiasts, one user describes his Secret Denim 20oz Type II jacket as 'a step above in quality compared to everything I own. I'm happy to pay for something made at this level, that will last for years.'

Distribution follows Oishi's philosophy: ultra-selective, slow, relationship-driven. Redcast Heritage (Europe), Denimio (Japan), and a handful of carefully chosen stockists. No mass retail, no mass e-commerce. Oishi chooses his retailers with monastic patience, a practice he has kept since the beginning.

Prices are high for denim: €250 to €400 for jeans, €350 to €500 for a jacket. That is the price of fabric nobody else in the world can make, woven on machines nobody else owns, by an artisan-weaver duo working together for 40 years.