You're correct. I did some digging.
"In the latest issue of Beau Society, Steinfeld gushed over seeing people dress up as her character, Mary, from the movie “Sinners.”
The 28-year-old thought it was such a good idea, she did the same following a “last-minute scramble” two hours before the party started. “But an even more niche and specific idea: Mary from the ‘90s! High-waisted jeans, leather jacket, high pony, lollipop (Blow Pop?). Just a thought,” she wrote."