ah sorry I missed your post about the parameters being set, its actually part of the same problem. the base cr2 that you got your joints from is set to load in posed position as I explained above. so when you applied the rig to your shirt it to was set to be posed in the same way, you need to strip out these settings in your cr2. you sould always use a doner that has no such preset pose. thats why people like mertext use a clothing item rather then the base figure. I prefer to use a special prepaired version of the base figure myself but then I know everything that needs to be removed from such to get it to work properly. I highly recommend the ConCloth tool in the Tool Collection mentioned earlier to create clothing cr2s rather then using the setup room. as ConCloth actually uses the base figure but strips out everything your clothing doesnt need only leaving the joints in a zeroed position.