Muir has received four nominations for the Canadian Screen Award for Best Costume Design and has won twice for Exotica (1994) and Lilies (1996).
She faced a formidable challenge while working on the latter film, not the least in designing a very excellent ballroom gown for male actor Rémy Girard.
"[1] Muir joined the crew for Robert Eggers' feature film The Witch in December 2013.
Muir created authentic-looking film wardrobes made of wool, linen, or hemp for an ensemble of nine principal characters.
Operating on a limited budget, she pushed for an increase in order to better meet the screenplay's demands, and the director’s vision was realized.