Hiding clothing body parts in 4.5

Something I've seen with 4.5 has to do with imported clothing made for any of the pre-Genesis figures...

Lets say I import some clothing that was originally for Michael 3. Now, let's say I want to hide some of the body parts for that clothing, like, say, the shins or thighs.

This is where the interesting stuff starts to happen...

There's a good chance that most of the clothing I want to hide will be gone, but now it looks as though there are leftover polygons that appear where the shins or thighs should be. It's as if the process for assigning polygons to body parts missed a few pieces.

I can post screen captures as examples if anyone needs them.

Has anyone else reported this? Is this a "known issue" about importing clothing?