In the early 17th century some men wore corset-like vests and waist cinchers to create a narrow waist to make their shoulders and chest appear wider. Fashion also called for men to wear slender
Men Wore Corsets, History Says
History of Corsets 1780-1912
Elegant and Structured: 1870's Gusseted Corset
An Appetite for Fashion Decadence: A Brief History of Stomachers – The Pragmatic Costumer
Stays – The Quintessential Clothes Pen
Revealing the iron corset
Bodies or Stays? Underwear or Outerwear? Seventeenth-century Foundation Garments explained. – Sarah A. Bendall
The Corset and the Crinoline. Chapter VII.
Making 18th century Stays for the Ideal Body Shape : Historical Undergarments
Grand Habit (III) fourth quarter of the 18th century
Shedding Light on a Dark Era: Baroque, Cavalier, and Puritan Fashions – The Pragmatic Costumer