How petrol blue became the Duchess of Cambridge's new wardrobe neutral

Since Pantone announced its 2020 colour of the year in December, ‘classic blue’ has been the hue on everyone’s lips.

Experts Reveal the Strategic Reason Why Prince William & Kate Middleton Often Wear Blue Clothes

Kate Middleton and Prince William visit Clitheroe Community Hospital in Lancashire

Meghan Markle Opens Up About Wearing Neutral Wardrobe Around Royal Family

Kate Middleton visits the Foundling Museum wearing blue outfit

Chronicling Kate: A Windsor Easter for the Royal Family as Coronation Plans Unveiled

Fashion advice - Page 34 - The Telegraph

Kate Middleton in head-to-toe blue for launch of Mentally Healthy Schools website - Kate's Closet

Prince William, Kate Middleton Announce Earthshot Prize Awards Winners

What significance does Kate Middleton's Zara skirt have? - Quora

The Duchess at 40 Part 3: Touring and Tiaras – What Kate Wore