Hi there

Not sure,but in those render I've used Bagginsbill AO setting from this thread 

http://www.renderosity.com/mod/forumpro/index.php?thread_id=2717720&page=7

AO node has been plugged to Diffuse_value on walls usually and settings has been pretty similar from above this thread and my Poser Units are Inches.All renders ahs been rendered with Gamma Correction On and IDL

But don't tried that on the clothes this I must admit 

Hope this helps

Thanks,Jura