The colours in the dance scene of West Side Story (1961) would be incredible as inspiration for a Summer RTW collection. I only just noticed that the Sharks and the Jets have colour themes.
Purples for the Sharks:
And mustard-y yellows for the Jets:
But it's all the colours in between that really make me swoon:
When I was little I felt sorry for the girls who were made to wear pencil skirts and thus missed out on this kind of fun:
Sad for them.