Id try ebay for a cincher, ive been looking for one myself (though my curves are already in the right places, they just need some controlling! lol) and have ended up getting one made but there are definately ones designed for male figures on ebay.
The Moulin Rouge had several male performers, La Petomane, Chocolat ,Valentin le Désossé (the 'boneless') also called L'Homme du Quadrille (the Quadrille man whatever that means). Take a look on the moulin rouge official website for some more historical stuff.
Nottingham Troupe the Deville Dolls have regular male performers, though as heather said, one is uber camp compere/host/narrator. They do have a sailor boy in one act and 'Bruiser' who is the hunky one they all swoon over for comic effect. I do think its great to get male performers in the mix, makes it all the more colourful!
Maybe looking up the history of sideshows, circuses, even freak shows and places like Coney Island might bring in some results? Heres a website about freakshows which is quite interesting
http://freaks.monstrous.com/famous_freaks.htm probably not what youre looking for but good reading!
And also like Kittie said vaudeville and music hall stars of the past is a great place to look!
Good luck with your search!
xCharlotte