Converted XPS Mesh in game makes my sim's body deformed

This is a weight paint issue. You will need to seperate your mesh from the Sim body and delete all weight paint data. Do a weight transfer on your mesh only. Do NOT transfer weights to the parts of the mesh originally from TS4. They are already correct and doing a transfer on them could mess them up.
When you have done the weight transfer, rejoin your mesh and import back into Studio and see how it works in game.
Check out this tutorial> sims4studio.com/thread/81/weight-transfer-blender?page=1

You may also need to vertex paint your mesh the correct colour. Follow this tutorial for that> sims4studio.com/thread/2479/vertex-paint-sims-4-mesh

I know this is going to be a pain to do but what he is saying is that all of the vertex groups that came with the mesh you converted have to be deleted. When you imported your mesh into blender both the cloned mesh and your mesh you are converting had vertex groups.
Like this.


The image above is an imported xps mesh that I imported into blender. In the image I circled the vertex groups. In order to get rid of the vertex groups with the exsisting xps mesh you need to press the arrow under the plus and minus sign and hit delete all groups.

Though you can fix your exsisting project easily without having to start from scratch. In your current project, delete all vertex groups and append the original cloned mesh you used to make your conversion.

Delete the rig 001 since you won't be needing it.

Highlight the appended clone mesh, shift and highlight your mesh then go into weight paint.

Select the vertex by name and it should automatically pop up with replace all. Don't worry about nearest face or vertex since they are essentially the same.

Then hit clean, all groups and save.

You only need to have the vertex group of the cloned mesh otherwise it will become deformed and at times will crash your game.

ok. i pretty much messed it up real bad and i don't want what i am doing. now the mesh has included the t pose and i am so bewildered right now. i think i need to start over. :(

@mooneonnature I've managed to fix your weighting issues but I noticed a few things that you can improve on later. First of all when you are working with a mesh that has nude parts underneath, you just delete the nude parts underneath and leave the sim's nude underneath.


Here is your package back as well. Though the best thing I can say is to refit the mesh to a nude part for the top and bottom half since your sim's hand is deformed and this is not due to weighting, it is due to the hand not being fitted properly.

Your package file

Don't give up. What I might suggest though is to try something simpler to begin with, understand the very basics of what is needed for a Sims body mesh to work correctly, and then work your way back up to this project.

Things to bear in mind:
Any mesh you import into the game MUST have the same number of groups as the original mesh you exported from Studio to use as a base.
You must make sure your groups are named correctly. This is usually studio_mesh_0 for the first group and then increase the number by 1 for each additional group.
If you are creating clothing that covers some of the Sims body and the skin parts will never be seen in game, delete them from the mesh. Leaving them in just creates extra work for your game.
You must perform a weight transfer so that your mesh knows how to behave with the skeleton.

ok bye thank you