The one colour you won't see Kate Middleton wearing during official royal engagements.

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When it comes to the Duchess of Cambridge’s fashion choices, her wardrobe seems to be filled to the brim with a variety of dresses and coats in bold, eye catching shades.

But thanks to a very thorough fashion stalk courtesy of Harper’s Bazaar Australia, the results have shown the 36-year-old is almost never seen in orange.

While there was one ‘peach’ outfit in 2013, and another occasion earlier this year where she wore a very red-but-bordering-on-orange, coat, the Duchess dresses in the fruity hue very sparingly.

Although we can only speculate over her aversion to the eye-catching shade, Catherine's general go-to look for official royal engagements all seem to feature a dress or coat in one statement colour, from deep sapphire blues, lemon yellows, teals and greens. And it's a sartorial cue she's possibly taken from Queen Elizabeth II herself.

Speaking about her mother-in-law's fashion choices Sophie, the Countess of Wessex, shared her insight in the documentary The Queen at 90.

"She needs to stand out for people to be able to say 'I saw the Queen,'" she said.

The Queen was also once quoted by royal biographer Robert Hardman, who's said he once reportedly heard the 92-year-old monarch say, "I can never wear beige because nobody will know who I am."

Now given the fact that Duchess Catherine has a similar status, she's really just dressing for the people.

All the ways Kate Middleton's style changed after she became a royal.

Here are just some of the bright and bold outfits worn by the Duchess, none of them orange (of course):

What is your favourite outfit Kate Middleton has worn? Tell us in a comment below.