A coronation mantle of cloth of gold woven in coloured threads with a pattern of emblems in a curvilinear pattern of foliage, crowns, fleur-de-lis and eagles with coloured roses, thistles and shamrock woven over, and with gold fringing and lined in red tabby silk. The gold clasp, which closes the mantle at the chest, is cast in the form of an eagle.

The Imperial Mantle, also known as the Pallium or Dalmatic Robe, was made for the coronation of George IV in 1821. The design of this example was based on earlier Mantles, which may be seen in portraits of the Tudor and Stuart monarchs, but in origin it is based on a priestly robe, and its form has changed little since medieval coronations. This link with priestly robes was a reminder of the divine nature of kingship.

The sovereign is robed in the Mantle in the investiture part of the coronation ceremony, which follows the anointing with holy oil. After this the sovereign is dressed in the Supertunica and Stole, with the Mantle on top. The various ornaments (swords, ring, orb, sceptres, spurs and armills) are then presented, before the moment of crowning.

The silk for George IV's Mantle was supplied by two mercers - William King and Philip Cooper, and the robe was made by the tailor John Meyer for £24. The royal goldsmiths Rundell, Bridge and Rundell created the 'elegant chased golden eagle' to form the clasp.