This is removed for the Anointing ceremony in which they wear the Colobium sindonis ("shroud tunic"), an intentionally plain robe.
[1][2] The association with ecclesiastical attire is intentional and meant as a reminder of the divine nature of the monarchy.
[1] The George IV Robe Royal is gold-coloured with symbols including foliage, crowns, fleurs-de-lis, eagles, roses, thistles and shamrocks embroidered in coloured thread.
After the coronation of George IV the robe was retained by the Dean and Chapter of Westminster before passing into private hands.
[2][1][5] A new Robe Royal was made by Werner and Sons of Braintree, Essex, in preparation for the coronation of Edward VIII.