My late mother (b. 1912) told me that she knew young women in the 1930s who used belladona as a beauty enhancement because it dilated their pupils.
—
Arsenic, just a bit!!, was also popular as it gave the skin a certain porcelain pallor which was quite the thing at the time.
https://www.atlasobscura.com/articles/the-poisonous-beauty-advice-columns-of-victorian-england
Between the arsenic and the too-tight corsets, it’s no wonder they needed those fainting couches.