Issues with a shirt I made?

Hi. Judging by the result, there are many mistakes in those tutorials, so you should watch something else. Look for the ones where you are not told to download 2.7.

The issue you’re witnessing is caused by missing steps in the weight transfer process.
- make sure the reference and your garment are visible and selectable;
- select the reference, Shift-select your garment, switch to Weight paint;
- choose Transfer weights. Then choose Nearest face interpolated and By name;
- then use Clean tool with All groups. Not using this tool is the reason your garment is flying in ts4;
- use Limit total with 4.


There are many other issues:
- in MD either model in quads or retopologize the mesh;
- choose a reference that is of the similar overall shape to yours. The chosen one was too short, the bottom of the shirt did not receive the right data and will clip into the lower body;
- do not import the obj into a new scene. Clone a similar garment(a reference), export the blend, open it, import the obj there. Do not delete the rig or body parts parented to it;
- you need inner geometry only in places where it is visible. Everywhere else it serves no purpose, only increases the polycount;
- do not remove doubles on the reference before transferring the data from it;
- you are meant to delete all parts of the body covered by clothing. The garment’s uvs must go in the freed space. In your case there will be not enough space in the torso area to put uvs in, but for the future, try to avoid that bottom right corner because people put everything there and you end up with CAS full of items that cannot be used together.
- the front of the shirt should not project the same texture as the back, it will look odd. The uvs should also not overlay while you bake textures