Brilliant Blues: COS Colour expert Chrissy Hilton Gee shares the inspiration behind our new summer shade The idea of indigo came from looking at the dyes used in traditional Japanese dressing, where it COS Dresses Nwt Cos Sleeveless Pleated Maxi Dress Dark Navy Flowy Drapey Sz Small Poshmark Silk mid length dress Cos Blue size XS International in Silk 55524603 80% Viscose 20% Silk COS Blue Dress. Knee length, Depop