We don't have synonyms for knife pleats yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are knife pleat.
(n) :
(sewing) A type of sharply pressed pleating, especially in a skirt or kilt, in which all of the folds are turned in one direction, with each pleat being three layers of fabric thick.
(n) :
(sewing) A type of sharply pressed pleating, especially in a skirt or kilt, in which all of the folds are turned in one direction, with each pleat being three layers of fabric thick.