Custom Clothing Stream vs Open IV

I’m trying to add custom clothes to my server. Most of the mod sites that host the download files have instructions to add the files to a mods/x64.rpf\models\... folder.

However, most tutorial videos show a different method which is similar to how you’d add custom resources to your server. This method relies on gtautils and uses a command to created a CustomClothing/ directory.

Is one option Client Side and the other Server Side? I’m only asked because I’d like all of my custom clothing to be available to everyone on the server, and so far, the “streaming” option has been messing up in-game (for example, custom Yeezy sneakers will cause all “tops” to go berserk and jump all over the screen). I’m wondering if I need a combination