Tutorial for converting adult clothes to children?

I've only managed to successfully convert bottoms for kids. Converting the tops tends to suck the arms inside of the body.

You have re-sparked my interest in this and I have managed to convert a top successfully for kids.

1. Export adult top mesh.
2. Export a child top mesh (A mesh that is as close in shape and size to the adult mesh will be best, but pickings are slim for kids, just go with what you feel is closest).
3. Edit down the adult top. I will state that converting adult male tops for kids is incredibly easier. To use female tops you will have to smooth down and restructure the breast area, which can make the mesh and textures look a little weird by the time it's all said and done.
4. Merge ALL pieces of the adult mesh into one solid piece (ctrl + J) and hit save.
5. Go to the child top and and hit shift + F1 to open the append window, find your adult top and click, go to Object and there should be the merged mesh called something like s4studio_mesh_1, double click to append it
6. Chop off the hands/arms of the adult top if you haven't already, as well as any pieces of the base child top you have showing through your mesh. Select the base child top and the adult top in objects mode and merge them. Hit save and import.
7. Go back to S4S and edit the shadow layer (should be the last RLE2 image).

If  the top imports and looks right in this window it will likely be ok in game. Some of the adult tops have bands inside the sleeves that don't always scale down correctly, but they can be fixed easily enough via scaling them separately. 

For bottoms though I can give you a quick tutorial (and a more in depth one later if you need).
1. Export the mesh from the adult bottoms that you want.
2. Get a random bottom for kids and import the mesh ontop of it and save the package file, then close it.
-2.5 Another way to do this is to go into the setting and untick all of the adult life stages and enabled adult and do the same close/re-open. I can't remember which way I did it when I converted the pants I made.
3. Re-open the package file and export the mesh from this, the body should now be a child default with the adult mesh floating around/above them. From here you will have to by hand scale and re-sculpt the mesh to fit appropriately on the child frame.

After all of that it is just a lot of testing. My biggest issue was having the bottoms pull texture from the tops, the reason for this is because I just scaled down and only adjust the height a little bit. The pants can be deceptively higher than you'd expect them to be. So, if the pants pull textures from the tops try fiddling with the height to make them bigger.

Hope that helps!

I've seen this before.  It's useful, but only for replacing textures, not whole meshes.  Thank you, though!

Is there a way to make adult shoes fit kids?