The King wore his Royal Navy uniform and his son and heir dressed in RAF colours at the funeral of the Queen in nods to the branches of the armed forces in which they both served. Both the Duke of Sussex and Duke of York, who also served in the military, were dressed in formal mourning clothes for the state funeral because they are no longer working members of the royal family.
The King
The King wore the Royal Navy No 1 tailcoat with sword, the collar of the Order of the Garter, Order of the Thistle Sash, Order of Merit neck order, Garter Star and Thistle Star. He also wore full-size medals including the Queen's Service Order (New Zealand), Coronation Medal, Silver Jubilee Medal, Golden Jubilee Medal, Diamond Jubilee Medal, Platinum Jubilee Medal and a Naval Long Service Good Conduct (LSGC) (three x Additional Service Bars).