The flag of Thailand consists of five horizontal stripes of (from the top of the flag to the bottom of the flag) red, white, blue (double width), white and red. The flag of Thailand was officially adopted on 28 September 1917. The flag of Thailand is sometimes referred to as the 'Trairanga'.
The original flag of Thailand was plain red with an elephant at its centre. During the First World War, horizontal white stripes were added above and below the elephant. Finally in 1917, the elephant was removed and a blue stripe added to the middle of the flag in its place. The blue stripe is said to have been added to the flag to express Thailand's solidarity with the Allies, whose flags were mostly red, white and blue.
The flag's ratio is 2:3.