Pure Blue Japan

Pure Blue Japan was founded in 1997 in Kojima, Okayama by Kenichi Iwaya, a former engineer for one of the historic Kojima denim mills who left to build a label dedicated to obsessive natural-indigo dye experimentation, hand-loom slubby weft yarns, and the kind of denim production that takes the Kojima craft tradition past where mainstream Japanese denim labels were willing to push it. The brand's name—Pure Blue Japan, abbreviated PBJ—encoded the project: pure indigo, pure Japanese production, no concessions to manufacturing efficiency or commercial cadence. The Pure Blue Japan vocabulary settled around the brand's signature 14oz, 16oz, 18oz, and now 25oz slubby selvedge denim, dyed in natural-indigo vats at the Kojima atelier, woven on vintage shuttle looms that produce intentionally inconsistent weft slubs, and finished with hand-set rivets and bartacks. The XX-005 and XX-013 model numbers—straight-leg and slim-tapered cuts in 16oz natural-indigo selvedge—became the brand's flagship references, with the broader lineup including chambray work shirts, indigo-dyed sashiko-stitched coverall jackets, and the brand's elaborate program of season-by-season natural-dye experiments that include kakishibu persimmon-tannin, sumi ink, and double-natural-indigo overdye programs. Pure Blue Japan distributes through the brand's own Kojima atelier-shop, plus the global denim-specialist retail network—Self Edge in the US, Standard & Strange in Oakland, Tate + Yoko in Toronto, Iron Heart London, Burg & Schild in Berlin, Hinoya and Pacific Side in Japan, and the broader Japanese-denim-aware multi-brand stores that treat PBJ as primary reference material alongside Iron Heart, The Real McCoy's, Studio D'Artisan, and Momotaro. The brand's slow-output discipline—small atelier production, no fast-fashion concessions, ongoing dye-vat experimentation—keeps Pure Blue Japan inside the small group of Kojima-era denim houses that still operate as craft producers rather than as branded distribution operations.