Simplicity, good taste, and grooming are the three fundamentals of good dressing.
– Christian Dior (1905-1957), French fashion designer.
Mr. Dior was the designer credited with the New Look in 1947. During WWII there was pretty much a fashion void. The years following the war, designers and fashionables alike were starving for something new, different, and indulgent.
The New Look offered longer full skirts, a nipped waist, and soft shoulders. It was a welcome return to femininity after years of more practical, military styling.
By the way, although Dior was the first to put the new silhouette out there he was not the only designer to come up with it. His fellow French designers Jacques Fath and Pierre Balmain were showing similar looks.