you can buy the bodies by themselves. By searching for TrueType or HotToys bodies.
One of the TrueType bodies actually comes with the taylor look-alike head so I took the head off that and stuck it on this advanced muscular body ... then i used that other body for my custom Tony Stark.
You can find tons of spare parts tho on ebay by typing 1/6 _____ so 1/6 pants or 1/6 shirts for instance. etc.
I actually would like to make The Jeremy Renner from the Hurt Locker like you did. I thought that was really cool. I also found this website. http://www.toyanxiety.com/16miscparts.aspx
you scroll to the bottom to look at the parts. Looked like some fairly good pricing on clothing.