While wondering around the Web , I came across this site
:http://susanmiller64.googlepages.com/cleavage
I don't know Susan Miller but base on the instructions she provides this seems like one of the most straigforward, inexpensive ways to get clevage.
If the results are anywhere near her picture, I would be extacic !!
Thought I would share since the questions comes up often here and there are a lot of differnet suggestions that people who have achieved great results put forth but I don't recall seeing this exact method. I have not tried this one but you can bet I am off to the fabric store this afternoon to get the material.