Gaps in mesh even after removing doubles

Hi. When you modify the shape of the mesh, you need to re-do weights and uv_1, otherwise the mesh will move and morph as wrong parts of the body.
This - re-transferring any type of data - must be done on a mesh without doubles. Even if two vertices have the same coordinates in 3d space, they can get different weights or uv coordinates
Also, some parts of the mesh are vertex painted with wrong colors

- join all parts again, remove doubles;
- vertex paint the mesh with 00ff00;
- select hand and the neck, separate, rename to Body. Do not transfer anything to it;
- clone a swimsuit, export the blend, append in the scene. Expand the rig, make feet visible and selectable, select, Shift D, then Esc to duplicate. Select feet.001, shift-select the swimsuit,join, rename to reference. Delete hands from it;
- transfer weights and uv_1 from the reference to your garment with these settings;
- delete the reference, join the body with the garment, assign cut 0000;
- in s4s main menu Create 3d mesh - CAS, type Noctis, clone, import the blend there. Check how it behaves in-game;
- if everything is fine, split sharp edges. If you want, you can use this package,just change Excludepartflags to 0. If not, split the mesh into multiple groups just like the original outfit was, assign corresponding cuts