The required softwares:
1. Many tutorials on Youtube has been outdated. There are missing detailed steps that will lead you into problems. Usually because they still use Blender 2.7.
2. Do not use blender version above 2.78.
Because the S4Studio CAS Tools won't appear.
You'll need this later to enter the cut number of your own mesh groups.
3. There isn't any official thorough tutorial on how to make CC. Many is based on own experience, test and error.
4. You need to have the basic knowledge of 3D stuffs, such as the terms. Otherwise it's very difficult to make your clothes CC. But if you want to start learning from doing this, be my guess.
5. Start learning from making a top clothes. It's the easiest to make. If you jumped to dress making without any knowledge. It will be a very stressful journey. Too much missing puzzles.
6. This tutorial isn't going to show step by step of how making one specific garment. Instead this tutorial only show you the principles.
2. Download all Marvelous Designer avatar, here.
3. Export a female, male, child rig blender file from Sims 4 Studio
Sims4Studio > Animation (Save your package) > Clips tab
4. Create your clothes in Marvelous Designer (MD).
A. Change your mesh into Quad instead of Triangle.
The reason is Triangle cause edge flow that will cause ugly deformation in the game (poking triangles). Click here to understand more on edge flow.
3 Ways to change your mesh from Quad to Triangle
Still in relation to edge flow to make your meshes appropriate for animation.
Do not use Remeshing (Beta)
C. Arrange your Marvelous Designer UV
5. Export your clothes from MD to Blender as OBJ.
How to export
File > Export > OBJ
here's the settings
6.Open a female, male or child rig blend file according to your need.
7. Import the garment OBJ file to Blender
File > Import > Wavefront(.obj)
8. Delete the vertices of the body mesh under your clothes.
Because it won't be visible in the game and less polygons mean faster game.
Make sure to enable select of your rig mesh in the outliner.
9. Close all the holes of your clothes.
There are two ways of doing this. Use it in accordance to your need or situation:
To work on this you need to understand how to select vertices on the 3D View and UV Map.
10. Data transfer uv_1
Note: If you watch many tutorials on YouTube, you'll see that they joined their garment mesh with the body mesh before data transferring. But the S4S moderator - mauvemorn said not to do that until the garment is fully functional: rigged, vertex painted, and uv_1 transferred. Beacause it might cause the uvs and weights not to transfer correctly to the body in the finger/ankle/neck area. While uvs will not cause you problems, weights in the finger area might get messed.
uv_0 map is for texturing the skin body.
uv_1 map defines how the the mesh will deform when adjusted with sliders in CAS.
This is how uv_1 looks like. This is the EA UV map representing the body from the neck to the calf.
Click RMB of your clothes on Object mode
Change the name of your clothes uv_map to uv_0
Add another uv_map, change the name to uv_1. But this uv_1 is empty, thus you need to transfer it from a clone (that's the terms S4S uses).
Open S4S > CAS (Create CAS Standalone)
Append it to blender
You'll see mesh groups on the Outliner with names like:
Join all of them CTRL + J
Delete rig.001, bone_bone_shape.001. You don't need them.
5. Do weight transfer
Suggested tutorial: https://www.youtube.com/watch?v=QxfhuskmKYg
6. Do vertex paint
7. Divide you garment into group meshes.
You have to divide your garment in several mesh groups in accordance to your clone reference.
How to do it?
Select your garment > in edit mode select your mesh > Press P to seperate > Selection
8. Give your group mesh a cut number in accordance to your reference.
9. Join the group meshes with the body part
Join the above waist line top with upper body without the head.
Join the below waist line bottom with the lower body without the feet.
1. When creating a long dress, which S4S dress should be used for importing the mesh?
The one that is the closest to yours in length. Dresses are rigged and cut differently depending on length;
2. Many S4S dresses has different cut/group mesh. Do I have to cut my long dress too in accordance to the S4S I choose to use?
Meshes are cut into multiple meshgroups to tune each of them differently. In the case with long dresses, it is done to hide shoes. If you won’t do it, the shoes might poke out
3. Do I have to follow the preexisting dress length when creating a custom dress?
You need to follow the logic of maxis meshes. Clone the tallest boots and look at how they are cut (in 3 meshgroups). If the dress goes below ankles, it should hide the last two meshgroups. If it is floor-length, it should hide all meshgroups.
4. If I had a long dress mesh, is it okay to use the top nude s4s mesh for importing?
No, never import full-body items into tops or bottoms. They are affected by different bones and have different slotraysinteractions.
Also, do not clone nude body parts because they come with a buff that can make sims embarrassed when wearing your cc.