Quote Originally Posted by MacLowlife View Post
Not to muddy the waters, but the PC seems to me to be directly related to the Saxon white tie tailcoat, which is usually worn with a waistcoat. I believe the cummerbund derives from sashes. There may be some connection or there may not.
The cummerbund was first introduced in the late 1880s as a silk sash that was wrapped around the waist, possibly inspired by military sashes from India and the British officers serving there. It went away after a few years then returned in the 1920s in it's current form as a tuxedo accessory.