Not all women in the 1900s wore heavily boned corsets. Some preferred to wear a lightly boned ribbon corset, usually called sports or athletic corset.
Victorian Sport Corset, ca. 1895 Credit:antique-gown.com Phone +49 171 9165833
The Purple Silk Edwardian Corset – Historical Sewing
Victorian fashion - Wikipedia
Dressing The 1900s Woman - Edwardian Lingerie - Sew Historically
Edwardian Sports Or Ribbon Corset - Sew Historically
Research: Edwardian Ribbon Corsets Part I – Wearing History® Blog
Corsets- a shopper's guide. - Blog
My Edwardian Wedding Part 2: trying a corset-waist. : r/HistoricalCostuming
side lacing sports corset Corset fashion, Vintage corset, Victorian clothing
Edwardian S-Bend Silk Corset - Sew Historically
S-Bend Edwardian Corsets – Lucy's Corsetry
Corset 1900 hi-res stock photography and images - Alamy