garter question

The Bride's Garter
The garter from the bride comes from the ancient custom of witnesses at the marriage bed (to make sure the couple consummated the marriage); the witnesses would bring it forth as a sign of the witnessing. It became such a violation of privacy that eventually the bride would have the groom throw it to prove consummation. This is one of the oldest customs surviving wedding rituals.

I found this on a website

i know what a raunchy little custom that has survived