Ask HN: Is it possible to create ultraviolet cloth dyes
Could a garment be created with a pattern in ultraviolet? It would appear white, but if you shone a UV light on it the pattern would come out. Many apparently white flowers turn out to have patterns visible in UV, which bees etc can perceive.
Seems like there'd be a certain market for fashion like that, with a sort of "hidden meaning." "Our translucent glow ink cannot be seen in daylight but glows green in the dark" it might glow under black light too Google “Blacklight reactive clothing”