surplice

noun1

1. •
   A liturgical vestment of the Christian Church in the form of a tunic of white linen or cotton material, with wide or moderately wide sleeves, reaching to the hips or knees, usually featuring lace decoration and embroidered bordures.

   • […] the flagstones of the floor, the mats, the banners above the choir, the steps of the ambo, the ancient books black with age, the cassocks and surplices, were all inundated with light. — 1918