I quite agree with this; to me, perhaps the most elegant looking film of the last 20 or 30 years has got to be Scorsese's "Age of Innocence". (I admit to not having seen Sofia Coppola's "Marie Antoinette".I think some people missed the point of this thread...
The five most elegant movies as opposed to just elegant wardrobes,
for pure elegance nothing compares with the Astaire/Rogers RKO films....
1. Swing Time
2. Gay Divorcee
4. Top Hat
I don't think Sunset Boulevard would qualify as an ELEGANT movie, it's actually eerie
or Wall Street or The first Thomas Crown Affair (1968)
...NOT REALLY ELEGANT MOVIES -
BUT, I would agree with secondary selections for Easter Parade, Funny Face, The Bandwagon, You Were Never Lovelier, Casablanca, The Philadelphia Story, maybe Breakfast at Tiffany's or the second Thomas Crown Affair (1999)