Aldredge, who is survived by her husband, Broadway actor Tom Aldredge, won three Tonys for her designs, for Annie, Barnum and the original production of La Cage aux Folles. She was nominated for Tonys 15 times.
She designed memorable costumes for the musicals A Chorus Line, Dreamgirls, 42nd Street, and the 1990 revival of Gypsy, among scores of credits.
Charlotte St. Martin, executive director of The Broadway League, commented, "Theoni Aldredge created iconic costumes that are associated with shows and pop culture spanning the last five decades. I have a photo hanging in my office of A Chorus Line, featuring her costumes, that inspires me every day."
Aldredge's first Broadway assignment was designing costumes for Geraldine Page in Tennessee Williams' Sweet Bird of Youth in 1959; her most recent was the 2006 revival of A Chorus Line. She won the 1974 Academy Award for Best Costume Design for "The Great Gatsby."