9090 was founded in 2018 in Tokyo by Japanese designer 9090 (the brand and the designer share the same name — a deliberately-Tokyo-Y2K-streetwear-aesthetic numerical reference) as a Y2K-and-2000s-anchored streetwear brand specifically focused on what the designer described as 'the visual culture of late-1990s and early-2000s Tokyo girl-streetwear archives' — the deliberately-Y2K-aesthetic visual language that defined the 109 / Shibuya gyaru-streetwear scene of the era. The brand has been one of the defining post-2018 Tokyo-anchored Y2K-streetwear-revival brands.
The 9090 vocabulary settled around several recurring elements: heavyweight cotton tees and hoodies with deliberately-Y2K-aesthetic graphic-design references (animated-cartoon-inspired prints, butterfly-aesthetic-motif graphics, deliberately-saturated rhinestone-and-glitter embellishment), deconstructed denim with deliberately-low-rise Y2K-aesthetic proportional construction, hand-printed silk-and-nylon dresses with deliberately-Tokyo-girl-aesthetic floral motif references, and a colour palette anchored to washed-pink, washed-pastel-blue, soft-yellow, washed-cream, oxblood, plus the brand's recurring use of deliberately-saturated Y2K-aesthetic neon-pink, electric-blue, and butter-yellow colour combinations. The brand has presented seasonal collections at Tokyo Fashion Week and through the broader Tokyo-streetwear-and-K-fashion-export network.
The brand is independent and held by the 9090 designer. 9090 operates flagship retail in Tokyo (Shibuya — the brand's home neighbourhood; Harajuku) plus international wholesale through Dover Street Market, GR8, HBX, Patta, the broader Japanese streetwear specialty retailers including Beams, United Arrows, and Nepenthes, and a curated set of international Y2K-revival-aesthetic specialty retailers. The brand has been one of the defining post-2018 Tokyo-anchored Y2K-streetwear-revival brands.