Yes it is blue.
Yellow, green and blue
Brazil wears yellow jerseys with either green or blue shorts
The only reason Queens Park Rangers Football Club were nicknamed the Super Hoops is simply because of the pattern of their football strip. Their home strip is blue and white with the alternating colors being horizontal. Hence the nickname.
All blue. Perhaps chosen by James Allan, the Scottish founder of Sunderland AFC.
Blue, from the Saltire flag of St Andrew although Mauve has often been used by Scottish Nationalists as it represents the colour of heather flowers that grow in the Scottish wilderness.The Scottish flag is blue with a white diagonal cross. The Scottish national football and Rugby teams play in dark blue strips. Scotland is also associated with tartan, which is a plaid pattern made of a variety of mixtures of colours, mostly blue, green, red, yellow, black and white.