Vintage Mod and Colorful Dress

I came across this photo of  models Sara Crichton-Stuart and Twiggy outside London's"Hung On You" boutique in 1966 wearing dresses that's very similar to one right now on Miss Sixties Vintage Fashion website. How often does this happen!

A very pop-art style shift dress. The colors are vibrant in blue, yellow, and red.
Cuff at wrist closes with zippers and the label reads "Ranelle Fashion, Inc"