Kay Cohen (born Kathleen Siddall on 31 December 1952 in Levin, New Zealand)[1][2] is an Australian fashion designer and business woman based in Sydney, Australia.

[16] During her time as creative director of Elle Macpherson Intimates,[1][10][17] the label was credited as the top fashion underwear brand in Australian and UK department stores.

Cohen's Expozay swim launch in Auckland New Zealand also featured Jennifer Hawkins two years before she won the Miss Universe title.

By early April 2004 reports of an Australian Fashion Week launch of Cohen's new luxury lingerie brand Pleasure State began to appear.

[9] Prior to the launch, the brand had been picked up by Australian department store David Jones[1] and Harrods, Selfridges, Bentalls, Liberty and House of Fraser in the United Kingdom.

[10] The initial collection featured vintage French leavers lace[4][10] and silks,[28] complemented by the reintroduction of woven fabrics, opposed to traditional knits.

[31] The fabrics included blends of pure silk with tactel and lycra,[9] intended to enhance the performance of garments for everyday wearability, which were predominantly sourced from France and Italy.

[35][36] In November 2005 Cohen's label was available across Russia in 90 Wild Orchid Stores[37] and opened the retailers fashion show at the Moscow Manege, quickly becoming their best selling brand.

[53][54] Silent Assembly is a luxury lingerie label which features Cohen's new bra technology Curvessence, intended to replace underwires.