blue dress black dress illusion The return of the Black/Blue and more Woman discovers the iconic 'Optical

Who: Joan Collins When: Circa 1981 Where: Promoting cult television programme Dynasty (and, of course, the power shoulder) as arch bitch Alexis Carrington

And, like her peers Taylor Swift and Beyonce, she works with designers across the industry rather than one in particular, so the result is less redolent of marketing than creative mind-meld

The more expensive lots fetched over 20,000 euros

- Lining: Polyester

When I tell you the material has changed the game for us in dress shopping for the best party dresses, it is just the slightest change that helps so much with shopping

With a lace-up back, it offers an adjustable and custom fit, adding a romantic and bridal touch that elevates the whole design