Full-length portrait needed w/ white bkgd... no white bkgrd though...

Hey gang...

I need to shoot a full length portrait of a man in business attire for his website and we want the final image of him to be isolated with a pure white background.

Unfortunately... I do not have a white background in my "beginners" studio. All I have is a green screen and black muslin backgrounds. Since I don't have a white background, does anyone have any suggestions on which background I should use to pull a key in post and isolate the man and put him on a white blank background?

I mean, the green screen is made for this kind of thing as far as video... but wasn't sure if there were any other suggestions that may work better, so I'm not up all not working on green spill/supression edges.

Thanks for any tips.

I woulod say the easiest way to get what you're looking for is to steal a large white bed sheet from your mom.
If yuo ask your subjcet to wear a dark/black suit, then your bg will prolly be a good 2-3 stops overblown in the final pics.

Strobe a white wall and use the dodge tool in PS fix the off-white areas. Use short DOF to blur out any texture in the wall

This is disposable white party tablecloth taped together: Simple 2 Light Portrait Set-up

Use your green screen and light it with a couple of strobes overexposed by at least 2 stops. It may look white when blown out in this manner.