Encyclopedia
Fortress
Crepe: twisted yarn with 1, 2 or more twists, with a twist rate exceeding 1500 turns per meter
Source: "FABRICS FOR WEARING APPAREL MADE OF NATURAL TWISTED SILK. GENERAL TECHNICAL SPECIFICATIONS. GOST 20723-2003"
(introduced by Order of Rosstandart dated November 30, 2004 No. 89-st)