What backdrop to use when photographing clothing?

I sell clothes on eBay and want to improve my photos. I've just purchased a mannequin and that's helping. Have done a bit of reading and know that I need to improve my backdrop. Which do you prefer to use as a backdrop, white fabric or white paper. I read that "Savage Paper" is good to use. If you use fabric, what kind of fabric do you like? Also, is it true that I need two sets of lights? One on the white backdrop to make the white background look even whiter. And a second set of lights on each side of the mannequin to light that up. Any hints you can give me would be greatly appreciated. Thanks in advance.