MD obj is partly ruined when imported on the blender [solved

<img src="http://imgur.com/a/7KFsr">


Hi I'm new to either marvelous designer and blender.
I'm trying to make a new mesh and was following the tutorial.

I made a new mesh, opened blender 2.78 and loaded a sims nude mesh and imported my new mesh obj into blender.
But the clothes are partly ruined when imported.
When I watched the tutorial, clothed should be all white, not partly transparent.
I don't know what I did wrong...
 
I noticed that the parts that I mirror pasted parts are transparent, but don't know how to solve it.
plz help me!