Philip Treacy le Bon, Kate Moss, Christy Turlington and Stella Tennant modelling in return for keeping Treacy's hats, which were all black. In 1994, he opened up his boutique at 69 Elizabeth Street, in Belgravia, London, right beside Isabella Blow's resicence at number 67. Treacy has designed hats for Alexander McQueen (another discovery of Isabella Blow), including his 1999 "white collection" for Givenchy Haute Couture in Paris, for Karl Lagerfeld at Chanel, and for Valentino, Ralph Lauren, Donna Karan, Versace and Rifat Özbek. In January 2000, he became the first milliner for 80 years to be invited to exhibit at the Paris
Philip Treacy has noted the support his parents gave him in pursuing his love of millinery, noting that his father would say: "whatever makes him happy". Treacy called his friendship with his significant mentor, Isabella Blow, as: "an affair without sex". Treacy also highlights the importance of fashion model Grace Jones as a collaborator and friend. Treacy is the second youngest of a large family and has eight other siblings, including one sister, the oldest sibling, and seven other brothers. He is particularly close to his sister, Marion Tubbing, who he credits with supplying him with editions of "Harper's and Queen" and