The Duke of Cambridge was dressed as a famous samurai warrior during a visit to the set of a long-running historical drama in Japan.
Prince William visited a Tokyo studio where a popular costume drama is filmed - dressing as a samurai who unified the country in the 16th century.
However, he stopped short of wearing a samurai wig, saying his brother Prince Harry would "never let me forget it".
He is on a week-long visit to Japan and China to promote UK relations.
The duke dressed in the costume of samurai warlord, Toyotomi Hideyoshi - who features in the Japanese historical drama Taiga - during the visit to Japan's public broadcaster NHK.
He wore a glittering helmet, a red and gold tunic and carried a replica samurai sword.
'Ready for action'
As staff put the helmet on his head, Prince William joked: "I feel there should be a sword in my hand as well."
Once dressed, he looked into a mirror and asked: "How do I look?" before adding: "I feel ready for action."
Before dressing up, he watched three geisha actresses dance, while another played a three-stringed instrument, called a shamisen.
Mao Inoue, the female star of Hana Moyu, who plays a character called Humi Sugi in the popular television programme, presented the duke with a bouquet of flowers and a hand-made wooden toy for Prince George.
The duke began his four-day visit to Japan - his first visit to the country - on Thursday by taking part in a traditional tea ceremony in the capital Tokyo.
The last time a senior member of Britain's royal family visited Japan was in 2008, when the duke's father, Prince Charles, came with his wife Camilla.