THe flag adopted in 1916 was red with two white stripes, but the central portion was altered to blue. It was an expression of solidarity with WWI allies (United Kingdom, France, United States and Russia), whose flags used the red, white and blue. The flag is given the name Trairanga which means tricolor.
Red symbolizes the blood shed for their country, white for the purity of the people protected by their religion and blue is for the monarchy.
28 September 1917
five horizontal bands of red (top), white, blue (double width), white, and red