At his mother's funeral . . .
"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).
Other medals included Canadian Forces Decoration (three x Additional Service Bars), The New Zealand Commemorative Medal, and The New Zealand Armed Forces Award".
Source:
https://www.manchestereveningnews.co.uk/news/uk-news/what-medals-worn-king-charles-25053596