Hello novelist999.

If you select the item of clothing that you are having the problem with, go into the materials room where it will show that the item has a transparent percentage tagged to it. If you move the slider to 0% transparency and go back to your main screen the item will be completely opaque and present no difficulty with posing.

When you are happy with the pose, go back into the materials room and reset the transparency percentage of the item back to where it was.

A fix i found completely by accident, but it worked.

Pat :)