The colobium sindonis (Latin for "shroud tunic") is a simple sleeveless white linen shift worn by British monarchs during part of the coronation service.
It symbolises divesting oneself of all worldly vanity and standing bare before God.
[1] The monarch is continually robed and disrobed during the ceremony, according to ancient custom.
[1] Following the anointing in the coronation service, the colobium sindonis is placed over the monarch's clothes, and then the supertunica, a long robe of gold brocade, is placed over that.
Wearing these garments, the monarch is invested with the regalia, crowned and enthroned.