Philip Treacy postage stamps issued by An Post. The other designers were Paul Costelloe, Louise Kennedy, John Rocha, Lainey Keogh and Orla Kiely. Treacy's hats have been exhibited, and are housed in the collections, of design museums including the Victoria and Albert Museum, the Metropolitan Museum of Art, and the "Galleria del Costume" of the Palazzo Pitti in Florence. "Vogue" magazine has described Treacy, on a number of occasions, as being the "greatest milliner in the world". Treacy is gay and in May 2017 he married his long–term partner of over 21 years, Stefan Bartlett, in a ceremony in Las Vegas. Treacy
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