The grey area for the clothes below is the Undershirt. You can use it to make inner clothing as the second layer.
Overcoat 01
Overcoat 02
Overcoat 03
Baggy
Relaxed
Take Overcoat 03 for example. You can make a clothing set with shirt on the outside and undershirt on the inside.
1.
Apply a G3 CloneCloth Character (Trey_Overcoat 03 & Relaxed B.iAvatar)
2.
Choose Avatar\Upper Body
3.
Select the Upper Template Material of Overcoat 03 via Load Material.
(Trey_Overcoat 03_Upper_Template Map.iMtl) Select Diffuse and press Launch to edit the Diffuse texture.
4.
Edit the Undershirt Front, Right Sleeve and Right Sleeve
5.
Edit the Overcoat texture
Final Diffuse Texture
6.
Edit the Opacity texture, Cut the outer clothing open, to simulate an unbuttoned shirt
and shorten the sleeves according to your will.
You can now see inner and outer clothing.
Note: Adjusting the Brightness and Contrast of Opacity in iClone may generate abnormal results. We recommend to change those settings inside of an image editor, such as Photoshop.