Films that lend themselves to fashion inspiration usually do so due to strong direction or a strong costume designer. For example Alfred Hitchcock was exacting in his costume views even to the shade of colour to be used - most famously eau-de-nil for Grace Kelly's suit in Rear Window. Hollywood costumier Adrian created incredible almost fanciful costumes for George Cukor's The Women. Yves Sant Laurent was asked to dress Catherine Deneuve for Luis Brunel's Belle de jour to great effect. Films provide great visual images to imitate or act out a look.
My particular favourite is Wong Kar-Wei's In the mood for love (2000). I've always been a victim in a sense of Kar-Wei's evocative, nostalgic costuming of Maggie Cheung - the beautiful patterns and style of her 1960s dresses. Wong Kar-Wei was in some respects recreating the nostalgic memories of his mother when they moved by themselves to Hong Kong in the 1960s. Interestingly Kate Moss has spoken of recreating the memory of her mother's clothes with her latest Topshop collection. I'm still smitten with the dresses from In the mood for love and often try to find similar ones but to no avail!