Blackwork Duvet Cover Indigo Blackwork, a counted thread technique, traditionally worked in black thread on white fabric and often worked in multiple or single colors, originated in Spain and was brought to England by Catherine of Aragon when she married Prince Arthur. Please Note: Pillowcases are not included with these duvet covers Sizes Single Duvet Cover: 140cm x 200cm Double Duvet Cover: 200cm x 200cm Kingsize Duvet Cover: 230cm x 220cm Super Kingsize Duvet Cover: 260cm x 220cm