The Irish-born Mcgirr is not a household name in the fashion world, but was head of ready-to-wear at JW Anderson until recently, and also had stints at Dries Van Noten and Burberry.
Mcgirr replaces Burton, who held her final show for the brand at the just-concluded Paris Fashion Week, with a notable starring role from Naomi Campbell on the catwalk.
She joined the label in 1996, just four years after it was founded, and became head of women’s collections in 2000.
