On the Outfit editor, you can set Skin Masks individually for every outfit.

Skin masks were created so that the skin layer of your model won't show from beneath the outfit while they're doing certain poses, or during a live stream, for example.
On the Skin Mask layer, you will need to paint over each part of the body you want to turn transparent so that it won't show through the clothing.

You can edit skin masks from the texture editor.
In this article, we'll explain how they're meant to be used.

What are Skin Masks

Before we get to explain how skin masks work, let's talk about why they're necessary.
Models created on VRoid Studio have two layers of meshes: one for the skin, and one for the outfit. Sometimes a particular pose or movement might expose the layer of skin beneath a model's clothes.

On the old beta version, you needed to erase the skin you didn't want to show from the texture of the body, and you had to create a new body texture for each outfit your model would wear, which took a lot of time and effort.

The stable version of VRoid Studio was developed so that you could manage those settings from the outfit editor and not from the body one.
This is possible through what we call "Skin Masks".

Let's take a look at an example of a skin mask.
Select Tops in the Outfit tab, pick a T-Shirt and click (or tap, on the iPad) on "Edit Texture".

Since we want to look closely at the skin mask, let's hide the T-Shirt texture first.
Then click (or tap, on the iPad) on "Skin Mask" at the top of the layer panel.
The T-Shirt comes with a skin mask like this one, in black and white.
On skin masks, the parts painted black in the UV view (the panel on the right side of the model) are where the skin won't show.
As you can see, the model's shoulders and chest area in this skin mask are hidden, because they might show from beneath the T-shirt.
The hidden parts are completely transparent in the 3D preview.

If you go to the Body tab and open the editor for the skin texture, you'll be able to see that this is still intact.
It's just that the texture becomes invisible where the skin mask is applied.

If you take appropriate action by making sections of the skin invisible, those areas won't show through the outfit.

How to Use Skin Masks

When wearing a preset outfit

Each preset item in the outfit category comes with its own skin mask.
You just need to wear that piece of clothing for the mask to automatically apply.

When creating a new outfit

You can edit the skin mask from the texture editor.
Click (or tap, on the iPad) on "Skin Mask" at the top of the right-hand panel.

Now you opened the editor for the skin mask.

In the image, the part that is painted black is where the skin won't show, while the white part of the texture is where the skin will stay as-is.
Use the brush to paint sections black and white and create the skin mask you need.