Kate Middleton wore yet another Whistles outfit along with an Alexander McQueen coat for the diamond jubilee concert.

Kate wore a Whistles' Bella bodycon dress in multipetal print WAS available for £150.

"Once again, the Discount Duchess has expertly mixed a splash of high-end designer with a dollop of affordable high-street and is continuing her love for all things McQueen," the Grazia Daily reports.

Kate's love for Whistles and McQueen is quite famous. This is definitely not the first time the Duchess is wearing a Whistles. For the last day of her Los Angeles tour, Kate wore a white knife-pleated skirt with a navy crocheted top from Whistles. Other occasions where Kate opted for Whistles include a £49 Zara dress first seen the day after the Royal Wedding, and a brocade dress coat which made its debut in 2006. She was also seen in Whistles in many of her engagement photos.

The Duchess has clearly proved that she can look great wearing both high-street and high-end fashion.

"She is known to favour high street clothing lines such as Whistles, Reiss and Topshop. But her prestige was cemented in fashion circles when she chose Sarah Burton, of McQueen, to design her wedding gown," The Mirror reports.

"It's the nosiest party the Queen has ever seen! And what a shindig it's been so far! To celebrate sixty years of reign as our monarch, the patriotic public were out in force to celebrate at Buckingham Palace this evening and - would you believe it - the sun popped out too. Hurrah!" Rob Brydon screamed at the diamond jubilee concert. Even as the celebrations were going on, all eyes were on Kate.

As is the trend, any brand that Kate endorses experiences high sales. So was the case with Whistles and Alexander McQueen.

A spokesperson for Whistles had tweeted: "We can confirm that Kate Middleton is in @thisiswhistles Whoop whoop!"

The increase in sales of the dresses worn by Kate is dubbed as Kate effect.

"Previous public appearances by the duchess have caused a fashion frenzy as women flock to emulate her style. The phenomenon has seen numerous outfits sell out within minutes," the Daily Mail reports.