This overview will help you if you are looking for films with authentic period costumes. This list includes only films that are based on the authentic dress of each era. While most costume dramas of the 40s to 70s adapted the film costumes to the fashion of their time, there are now but a whole series of films with some wonderful costumes.
Antiquity - Middle Ages
Alexander
Brave Heart
Baroque
Alatriste
Girl with a Pearl Earring
The Man in the Iron Mask (1998)
Empire
Emma (1996, TV production)
Emma (1996, film production)
Mansfield Park (1999)
Pride and Prejudice (1995 TV miniseries)
Pride and Prejudice (2005, film production)
Sense and Sensibility (1995)
Becoming Jane
Goya's Ghosts
Second Rococo
Anna and the King
Cold Mountain
Sissi (1955)
North and South
Gone with the Wind
Turn of the century
Angel
Miss Potter
Out of Africa
Klimt
Titanic (1997)
Room with a View
Antiquity - Middle Ages
Alexander
Brave Heart
Renaissance
Ever After - Ever After
Elizabeth (1998)
Elizabeth - The Golden Age
Shakespeare in Love
The Other Boleyn Girl
Baroque
Alatriste
Girl with a Pearl Earring
The Man in the Iron Mask (1998)
Rococo
Casanova
Perfume
The Duchess
Dangerous Liaisons
Marie Antoinette (2006)
Valmot
Empire
Emma (1996, TV production)
Emma (1996, film production)
Mansfield Park (1999)
Pride and Prejudice (1995 TV miniseries)
Pride and Prejudice (2005, film production)
Sense and Sensibility (1995)
Becoming Jane
Goya's Ghosts
Biedermeier
Jane Eyre (1983)
Jane Eyre (1996)
Vanity Fair (2004)
Second Rococo
Anna and the King
Cold Mountain
Sissi (1955)
North and South
Gone with the Wind
Early days
Anna Karenina
Dracula (1992)
Silk / Silk
The Age of Innocence
Turn of the century
Angel
Miss Potter
Out of Africa
Klimt
Titanic (1997)
Room with a View