Help porting a game model

Hi. You should search for clothing conversion video on youtube, does not matter from what game so long its to TS4. The process is not easy to explain in one post

That's probably because you didn't assign the cuts correctly. As mauvemorn said, the whole operation is more complicated than it seems so pointing you out on tutorials will help you more than trying to explain the whole process. There is no simple way to put what you're trying to do ^^

Here's one about cut numbers: sims4studio.com/thread/13120/cut-numbers-easy-explanation?page=1&scrollTo=102652
One about transfering the weight to fit your new model on a sim: sims4studio.com/thread/81/weight-transfer-blender?page=1
And overalls, the index of cas tutorials for you to understand the process of clothing: sims4studio.com/thread/661/index-custom-content-tutorials-poses