Texture not showing, Mesh is transparent

Hi. This is not transparent texture, these are flipped normals.
- with everything still selected, Mesh - Normals - Recalculate outside

There are other issues:
- the meshgroups have incorrect cut numbers. It should be 0000, 0001, 0002;
- there is the right side of the body and the left one. When you flip one side of the mesh, you must re-do its uv_1 and weights;
- the mesh is also not vertex painted correctly.

Find a similar maxis hair and transfer the weights, uv_1 and vertex paint to it

None of this is fixed

It looks like you deleted one side of the hair and then used the mirror modifier, right? The two hair halves are all smooshed up where they meet and there's a hole in it. If you use the mirror modifier make sure you put a checkmark next to clipping. That way the two sides will sort of merge together. Right now, there is a ton of clipping where the two sides meet (below the hole).

The weight paint will appear differently depending on which bone (or joint or weight or vertex group. It's all the same thing) is selected. Put the hair in weight paint mode and in the area on the right where there's an upside-down triangle, in the vertex group menu, click on the different bones and you'll see how parts of the hair change color. Red means that section is assigned 100% to a bone, blue means it's assigned 0%. The other colors are sort of in-between percentages.

To make a hair these are what's required:

1. a uv_0 (this is case-sensitive) that holds the "normal" UV layout so that your texture will show properly.
2. A uv_1 (this is case-sensitive) that's needed so that your hair will respond to the CAS sliders.
3. Vertex paint so that your hair will respond to the CAS sliders.
4. Proper cut numbers so that Studio knows which mesh group is which. Your hair mesh should be separated the same way your EA reference mesh is. If the reference mesh has three mesh groups so should yours. Your cut numbers must be exactly the same, as well.
5. Hat chops. One for hats that sit on an angle and one for hats that sit straight on the head.

As I said, right now the back of the hair has a large gap and there's a lot of clipping where the two halves meet. The uv_0 is kind of a mess so the texture looks strange in the back. There is no proper uv_1, there are no hat chops, possibly the cut numbers aren't right, and possibly the vertex paint is the wrong color. I'm not sure about those last two, however. Mauvemorn could tell you better than I can.

I really, really recommend that you examine an EA hair. Check out its weight paint, the vertex paint, the cut numbers--all of the things I listed above take a look at so you can get a feel for how a hair should be constructed.