Backface Culling
How things are rendered in game
One thing to understand about GTA, for both modding clothing and regular props, is that for the most part, the game engine renders things as single-sided materials. This means that objects do not have both a viewable "front" and "back". Instead, the front-facing side is visible and the back is invisible.
Take a look at the MP Male uppr_015, for instance.
Codewalker RPF renders things single-sided like the game does. You can already start to see this effect around the collar/neck. As you can see, the "front-facing normals" of the model are visible, and the inside is not.
Most GTA clothing is 'closed off' around holes like the sleeves and collar so that you do not see through the inside of the clothing. The other option is to duplicate & flip the geometry of the mesh, so that you can 'see' the inside, but this is of course more costly performance-wise.
Unfortunately, the modding community is rife with people who do not understand this concept and make bad mods that are neither closed off nor have inside faces, which is why I feel it's important that this is one of the first concepts I explain.
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