It's a constant inspiration for fashion designers: the kimono. From the traditional Japanese garment to the effortlessly chic cool-girl pyjamas of today, wearing a kimono proves that, with its flowing silhouette and V-neckline, you've got the key to femininity.

[Photo/Courtesy of Ron Sachs/DPA]

Actress Blake Lively (flanked by Ryan Reynolds) in a kimono-style robe by Ralph & Russo Couture for the White House State Dinner in May 2016.