I honestly think the only way to correctly rig weight mapped figures is to use the Setup Room because it properly transfers the weight maps.  I've had absolutely no luck with any other method.

Import the OBJect file, all settings unchecked

Go into the setup room

Click on the Miki4 CR2, and when asked, respond No to the Grouping question.

Immediately return to the Pose Room, change the name on the Parameters tab to something other than Miki4, i.e., Jeans and then save the file to the library.

Now, the jeans will work without any changes, but I do use Poser File Editor to clean up the CR2 as there's stuff in there which is simply unnecessary and bloats your CR2.  If you plan to distribute the file, I would say this is a necessity.

Hope this helps.