What is "corsetted"

Usage examples of "corsetted".

The only other occupant of the drawing room, a handsome if zaftig woman, brutally corsetted into yards of lilac faille, regarded them for a moment and then turned away with a sniff at the sight of Caris' plain livery and Antryg's shabby coat, crystal beads, and bruised face.

I'd much have preferred going to watch Nala Damajanti and her Amazing Snakes at the Palace, or the corsetted fat bottoms and tits in George Edwardes' show, but being a besotted grandparent I'd have let my little Selina coax me into watching three hours of steady rain and been happy.