I use to be sooo into movie costumes and the stars who got to wear them. But I haven't done this in a long time. Shearer's over the top extravagant wardrobe for this movie is almost ( I say almost - it was the depression) too much. But the one review I found that was the most comprehensive and fun was this one
https://frockflicks.com/tbt-marie-antoinette-1938/

Hope this works if you are interested