You guys already named most of them...
Bertolucci's The Conformist has great clothing!
Lots of Woody Allen films: besides obvious ones like Annie Hall, there is Play it Again Sam, Interiors, or more recently Match Point and Vicky Christina Barcelona. His characters are often well dressed and styled well.
Pretty much anything by Sofia Coppola.
The clothes in The Talented Mr Ripley were stunning.
For 90s stuff Singles; for 80s Pretty in Pink.
Love the clothes Eva Green wears in Cracks
Out of Africa was huge in its day.
There are gazillions more, of course, and I didn't even really consider costume drama...