To actually remove the clothing you will need to delete it in the Scene Manager. What you did is just hide it, but the actual mesh is still there and hides the mesh of the body parts.
If you want to keep the clothing in place, then you can make the body parts visible, using Edit Mesh.
A. With the character selected, click "Edit Mesh".
76% of original size (was 666x19) - Click to enlarge
B. At the Edit Mesh panel, click "Face" and then click "Show All".
76% of original size (was 666x19) - Click to enlarge
C. All of the mesh will be shown. Click Edit Mesh (at the top), to close.
76% of original size (was 666x19) - Click to enlarge
Be aware that if you now unhide the clothing that there may be poke-through.