The American dress reform movement arose in the mid 19th century.
From Bloomers to Pantsuits: A Brief History of Women's Dress Reform
When did women woman start wearing pants in western culture? - Quora
How Women Wore Pants Throughout History
Trousers as women's clothing - Wikipedia
What Is “Black Tie Optional”? The Most Confusing Wedding Dress Code, Explained
The Not-So-Straightforward Story of Women and Trousers
Jeans - Wikipedia
A brief history of when (and why) women started wearing pants, by Sneha Konda
A brief history of women in pants