Hawaii's flag has quite an interesting history:
[quote] The flag of Hawaii (Hawaiian: Ka Hae Hawaiʻi) has previously been used by the kingdom, protectorate, republic, and territory of Hawaii. It is the only US state flag to include a foreign country's national flag. The inclusion of the Union Jack of the United Kingdom is a mark of the British Empire's historical relations with the Hawaiian Kingdom, particularly with King Kamehameha I. The flag continued to be used after the 1893 overthrow of the Hawaiian Kingdom.
[quote] In 1793, Captain George Vancouver, having previously visited the islands with Captain James Cook, returned in command of HMS Discovery. During the visit, Vancouver met with Kamehameha I and presented him with a Red Ensign, used for British civilian vessels. The Kingdom of Ireland was not a formal part of the United Kingdom before 1801, which meant that, at this time, the British flag did not contain the Saint Patrick's Cross of Ireland. This version of the Red Ensign, as well as the current version which added the cross in 1801, was the unofficial flag of the Kingdom of Hawaii until 1816.
[quote] An adviser to Kamehameha noted that the Union Flag could draw Hawaii into international conflict, as his kingdom could be seen as an ally of the United Kingdom, and he subsequently lowered the Union Flag over his home at Kamakahonu. While disputed as to its historical accuracy, one account stated that in order to placate US interests during the War of 1812, a US flag was raised over Kamehameha's home, only to be removed when UK officers in the court of Kamehameha vehemently objected to it. This would explain why the resulting flag of Hawaii was a deliberate hybrid of the two nations' flags.
[quote] In 1816, Kamehameha commissioned his own flag to avoid this conflict, which has evolved into the current flag. It was probably designed by one of the commanders of the Royal Hawaiian Navy (which consisted of HHMS Kaimiloa), former officers of the British Royal Navy, who advised Kamehameha, based on a form of the British naval flag. There is debate as to the actual designer: some credit Alexander Adams, others George Charles Beckley. It was very similar to the flag of the British East India Company in use at about this time, which had only red and white stripes. Captain Adams used this flag for the first time on a Hawaiian trade mission to China in 1817.
[quote] There may have been different versions of the flag with different numbers of stripes and colors. The number of stripes also changed: originally, the flag was designed with either seven or nine horizontal stripes, and in 1845 it was officially changed to eight stripes. The latter arrangement is used today.