What color robes do priests wear during Confirmation?

Catholic priests do not wear robes when administering the sacrament of confession. Usually they wear a surplice, which is a white long-sleeved linen garment that extends just beyond the waist, and a purple stole. The purple stole is considered so important that even when in prisons or in times of extreme persecution, priests hid a purple stole on their persons, even if it was no more than a purple thread, for use when hearing confessions.