[JanetCD]

There is a product called Cleavage Creator: http://www.designhers.com/Merchant2/agent.mvc?AG=tgnow&SC=PROD&S=001&P=CCDIVA

Do you put this under your bra, or over your bra? I don't think it would offer enough coverage for me if I wore it on its own....

Looking at the web site for the Cleavage Creator appears it is worn over the bra. But might work on it's own.

There is a bra for crossdressers called Diva Bra that is almost the same method: http://www.clcrv.com/crossdressing/divaDsnX.cfm