who is allowed to wear white when visiting the pope
Privilège du blanc A reigning Catholic queen or princess retains this privilege at the discretion of the Pope, by remaining a Catholic in good public standing, through marriage to another Catholic monarch, or simply by grant of the Pope at his dispensation.[citation needed] Catholic royalty may freely choose whether to exercise the privilege depending on the importance of occasion; if they don't, this is termed as "declining the privilege"[citation needed], and the fact of choosing to wear black garments at certain points of Papal audiences does not negate her privilege to be dressed in white.
White-collar worker The term refers to the white dress shirts of male office workers common through most of the nineteenth and twentieth centuries in Western countries, as opposed to the blue overalls worn by many manual laborers.