Blue shirts are the new white shirts, we've found 7 that will instantly lift your fashion mojo, from £30

I noticed this trend on the Catherine, Princess of Wales first. Then it popped up at London Fashion Week among editors and influencers: sky blue poplin Oxford-style shirts, worn with jeans, layered under jumpers, worn over skirts, and thrown on with leather jackets.

The menswear classic has been adopted by women across the age groups and is being worn in just as many ways, styled up and down with equal ease.

For the first time in years, it’s edged the classic white shirt out of the limelight. It’s a funny thing when people switch staples - they tend to do it all at once - and suddenly what felt timeless looks a little tired. The blue shirt, meanwhile, has been given a full style refresh by many brands, all at the same time, reworked in cuts and fabrics that make it feel current again.

It’s cropped and swingy at Uniqlo, oversized or drawstring-style at & Other Stories, utility-style at Zara, patterned at White Stuff, striped at Arket, and even rendered in faux suede at Marks & Spencer. These iterations are proof that a simple classic can still be reimagined in countless ways.

The best versions are cotton and roomy, with that slightly borrowed-from-the-boys feel, like Boden’s, which is already selling fast.I first looked for one two weeks ago, but there weren’t many in stock.

Today, though, stores from Uniqlo to the high street more broadly seem to have caught up, with rails steadily filling with shades of sky blue. It's the quiet but definite shift in what feels fresh for spring.

Shop the 7 best below