A few months ago I spent some holiday time among the rows of lovely and unusual fabrics at H. Kimura, an unassuming little fabric shop with an overwhelming selection in Kealakekua, Hawaii (my thanks to my sister for taking me there!). This shop was well stocked with Japanese cotton prints like the chrysanthemum cotton print in the detail below, which I made into a Walkaway Dress (Butterick 6015).
I've been fond of Japanese patterns for many years, and I am grateful that there are sources closer to home than H. Kimura where I can easily get at them. One shop in New York is City Quilter, and a spot online with plenty of irresistible Japanese offerings is Reprodepot. But if you want to read up on the art and the history of Japanese fabrics and textile design, I'd recommend turning to the Library. NYPL's Schwarzman Building has dozens of illustrated books and exhibition catalogs to browse through. And don't forget about the Digital Gallery, with its many samples of Japanese textiles digitized and ready for browsing online.