Creating a full body outfit from a .mesh file?

Hi. This is not exactly easy but easier than converting them individually.
Could you please import this file into a blend, upload it on mediafire.com and share with us so that i could walk you through the process.
Also, please tell me if your computer can run blender 4.2

- install Blender 4.2 in the recommended location or on the d drive;
- in s4s settings change the Blender path to blender.exe in Blender 4.2 installation folder specifically;
- in s4s main menu, with Create CAS standalone selected, click on CAS;
- filter the catalog by Male and Clothing body, choose one swimsuit, click Next, name it something, save somewhere;
- open this blend file in 4.2, switch to the orthographic (NUM5) front (NUM1) view;
- double-click on s4studio_mesh_1 and rename it to Reference;
- if you were to toggle the eye icon next to it, you'd see that this item starts from the neck and ends at the ankles while your item contains the whole body, so you need to add the feet and the head to it. For this, expand the rig and toggle the eye icon next to head and head_2 to see which one is the mouth cavity and which is the real head, it differs from frame to frame. Click on Filter and enable the cursor, then toggle the cursor icon next to the real head and feet to make them selectale;
- select the feet, Ctrl-select the head, in 3d view press Shift D to duplicate, then Esc to confirm;
- in this order: select feet.001, then Ctrl-select head.001, then Reference, in 3d view press Ctrl J to join;

- import or append your mesh;
- in the outliner select untitled, in 3d view change the pivot to 3d cursor, press S, and resize the whole thing until it matches ts4 body. Switch to the side view (NUM3), press G, move forward until shoulders somewhat match;

- as you see, the pose does not quite match, so here comes the worst part of this process. Unfortunately, the rig is set up in a way that you cant really adjust it symmetrically using the traditional method. The fix that exists for this issue does not seem to work either, so I suppose you have to do twice the amount of work;
- so expand the rig and click on Pose. Change the pivot back to Median point, enable X-ray, select one hip bone, press R, align it with the leg. Do the same with the other side;

- switch to the top view (NUM7), align arms on both sides. In the front view do that further. To make hands smaller you can select the hand bone and press S;
- once you have everything finally aligned, select one object under untitled, Ctrl-select another, join them with Ctrl J;
- apply the Armature modifier;

- in 3d view press Alt P, choose Clear parent;
- RMB-click on untitled and choose Delete;
- select your object, rename the uv map to uv_0;
- delete all vertex groups;

- select uv_0, select everything with A, in the uv editor assign this template as the background. You will see all uvs stretch, so bring them back to the original size with S Y 0.5;
- deselect everything with Alt A;
- In the Material tab choose the hair material and click on Select;

- in the uv editor press S 0.5 and put it in the space meant for hair;
- select the head material, shrink it with S Y 0.5, put in the head space;
- put the outfit in the bottom part of the image;
- with all uvs selected, UV - Export uv layout, change Fill opacity to 1. Later you can use this image to create a diffuse map;

- now you can finally transfer all data. Select your item, add Data transfer, choose Reference as Source, set the rest as explained below, Limit total;

- the head is affected by many bones responsible for moving and morphing. Your mesh does not need them because it is covered with a mask, so you can delete them. Selecting the whole head and the face, assigning it to the head bone. Select everything with A, Mesh - Weights - Normalize all. This will delete all other bones in that area;

- give your item cut 0, delete the reference, save;

- in s4s main menu click on CAS, in the search bar type in Noctis, clone this outfit, import your blend;
- use the exported uv layout to combine your diffuse maps, then import it;
- make other maps blank;

mauvemorn

So far so good, but I'm stuck on these steps:

- in 3d view press Alt P, choose Clear parent;
- RMB-click on untitled and choose Delete;
- select your object, rename the uv map to uv_0;
- delete all vertex groups;

When I click Clear Parent, it doesn't seem to do anything. I right clicked on the untitled but it deleted the entire model I posed and a larger version appeared in its place, unposed.

imgur.com/a/DcRnMuy