The colour blue has many associations, and Karen Haller, behavioural colour psychologist and author of The Little Book of Colour outlined why the Cambridges enjoy wearing this colour.

Haller said: “Wearing the same hue, the Cambridges are showing they are coming together as a family, representing themselves as a cohesive unit.

“When it comes to colour psychology, darker blues communicate you are in a position of authority, trustworthy, reliable and can be depended on.

“You have a sense of duty and take that seriously with committed focus.