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ONI Denim 679ZR AIZxBK "Aizumi x Black Secret Denim" 20oz Strong Tapered Jeans


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One of the most important types of denim in recent years has been Oni’s Secret Denim. First launched in 2012, the Secret Denim has been one of the most desirable denim fabrics by Denim Heads around the world due to its unique texture and incredible softness and comfort. Only Oishi-San can produce this denim, and no one else can reproduce it. He uses extra-thick yarns of three different kinds of cotton woven at ultra-low tension on a vintage shuttle loom. The result is a beefier, extremely knotty unsanforized 20oz fabric with a fantastic slub, roughness and hairy texture.

For this Aizumi x Black secret denim version, Oishi-San experimented with over-dying denim. He wanted to pursue an ink style dye effect without the use of over-dye, and the subsequent series of experiments over the past years resulted in the Aizumi. Aizumi brings together the Japanese words for indigo (aizome) and black (sumi) denim. First, the warp is rope-dyed in aizumi (indigo and black), and then, the weft is rope-dyed in black. The mix of these two dying methods has produced a pair of jeans that is incredibly dark in colour. The slubby, low tension denim is a detailed heavyweight with a unique patina. By wearing it many times, the surface layer of the warp threads will be scraped off, and the greyish indigo navy blue will begin to appear little by little.

The jeans are made with all the superior-quality ONI details such as black-coated doughnut buttons and hardware (to match the dark tone of the denim), high-quality pocket bags, heavy-duty bar tacks and a custom veg-tanned deerskin indigo-dyed leather patch.

The cut is the ONI's 679 strong tapered fit. The taper is pretty aggressive so that it gives a slim-fitting silhouette while allowing for a lot of space at the thighs with a high rise.

The legend of ONI is alive to this day. In recent years Oishi-San has devoted himself to experimenting with widely varying grammages, rough textures, different indigo dyeing techniques and novelty cuts while always maintaining a very limited production and wielding his experience in denim which now goes back more than 60 years.

[Visit our LOOKBOOK and discover a great selection of heritage street-style outfits]

  • 20oz unsanforized aizumi x black Japanese selvedge denim. It is a one-wash version so expect no shrinkage
  • 100% cotton
  • High-rise
  • Strong tapered
  • Heavy-duty bar tacks
  • Warp: aizumi (indigo-black) / Weft: black
  • Slubby, uneven and hairy texture
  • Ultra low-tension weave applied on the shuttle loom
  • Selvedge line colour: electric red
  • ONI custom black-coated copper doughnut buttons and hardware
  • Hidden rivet pockets
  • Peek-a-boo selvedge coin pocket
  • Durable black cotton-lined fabric in front pockets
  • Raised belt loops
  • Custom vegetable indigo dyed deerskin leather patch with ONI logo
  • Super limited quantities
  • Made in Japan


FREE SHIPPING on orders over €100.

€6 shipping cost on orders under the value mentioned above.

(Delivery 24h via UPS)

Europe & the UK

FREE SHIPPING on orders over €150 (or the equivalent in GBP).

€12 (or the equivalent in your currency) shipping cost on orders under the value mentioned above.

(Delivery 24-72h via UPS)

Rest of the World

FREE SHIPPING on orders over €250 (or the equivalent in your currency).

€25 (or the equivalent in your currency) shipping cost on orders under the value mentioned above.

(Delivery 24-72h via UPS)

If for some reason you are not happy with your purchase you can return it to us within 14 days for a free size exchange or refund.

For more info please visit our returns or size exchange pages.