Britain's First Lady Samantha Cameron has been topping best-dressed lists for quite some time.

And it seems the British fashion ambassador has gained a sizeable legion of fashion followers, indicated by the sharp rise in sales of outfits she is snapped wearing.

A light blue Marni Watercolor print dress went up 85% in popularity after she was pictured at the Downing Street barbeque with Michelle Obama.

When Carla Bruni paid a state visit in June 2010, Samantha's black and white maternity dress bumped the sales of similarly coloured Hybrid Dress Academy gowns by 80%.

But the most influential of the elegant First Lady's ensembles was the black floor-length gown she wore to the British Fashion Awards in December 2010.

In response, the sales of floor-length black gowns increased across the board.

One dress in particular, by Halston Heritage, saw a sales increase of an incredible 98%.

It seems then that to keep up with the lastest styles in women's wear, one need look no further than our very own Samantha Cameron.  

Photo: © Getty