The King, 75, attended the second State Opening of Parliament of his reign in London on July 17, a ceremony that called for him to sport the Imperial State Crown and elaborate Robe of State.

Read more: King’s coronation: Live updates and your questions answered as Prince Harry arrives The robe of state is made from crimson velvet, gold lace, and trimmed with ermine fur. Ermine fur comes ...

The 18ft-long Robe of the State is an ermine cape with crimson velvet train, weighing some 15lb. The King’s Robe of State was worn by King George VI at his coronation ceremony back in 1937.

The King was wearing the Imperial State Crown and ermine and velvet Robe of State as he prepared to deliver a speech setting out the new Labour government's agenda in the House of Lords.

With the robe not cooperating, a page boy returned to the king’s side and adjusted the robe properly. Charles appeared to whisper “thank you” to his young helper.