Need help tweaking my t-pose-ish mesh to fit the sim arms.

Hi. If the jacket comes with the armature, you should just change the pose and apply it.
If the jacket is not rigged, then you will have to change the pose of the reference, transfer weights, then change the pose of the jacket to align with the body.
This video covers this process but for a different situation. Start watching from 1:44. Watch it first without following to get the idea of the order and only then follow

See rig? See the eye icon next to it? You need to enable it next to rig

No, you need to align the rig with the default ts4 pose. After that you need to apply the armature modifier. Then you can save the file and append the jacket in a different blend with the untouched rig

1). Jacket’s arms are too high
2). You make the reference’s arms higher to match them by changing the pose of the rig;
3). You apply armature so that the reference’s pose is changed permanently;
4). You transfer weights from the ref to the jacket;
5). Now you need to lower the arms of the jacket. First you change the pose of the rig permanently;
6). You change the pose and apply the armature;
7). You clone something, export blend, append the jacket there, do the other steps.

Appended the jacket into another blend file to continue the rest of the steps, However I joined the jacket and the nude mesh together and the hands go into another position (https://imgur.com/a/np82WMQ) This seems to be my only problem now, will this affect how it works in the game, or is there somehow I can fix this issue?

I think I did all of the steps, however importing it into S4S the jacket is laying on the ground instead of on the body (https://imgur.com/a/bGf2hLl)



No clue where I went wrong since all else seemed well

Edit: I think I accidentally skipped a part, where you said to reset the rig. Is there a video on that part? I think what you’re saying is to reset the rig pose back to how the sim pose was originally, I think I’m stuck on how to do that.