I Tried Everything such as Youtube and Script.com and sooo many more sooo pls help.
If you want to force the player to wear an outfit, you can insert a model called StarterCharacter into StarterPlayer to be used as the character model:
A Model instance named StarterCharacter [inside StarterPlayer], which will be used as the character model for all players
A simple way to do this is to change your character to be wearing the outfit you want everyone to wear, and then join your game in studio. Then, copy your character model from Workspace in the explorer, exit test mode, paste it in StarterPlayer and rename it to StarterCharacter.
Otherwise, if you only wanted to give them specific items, you can look into using LoadCharacterAppearance to give them the items through scripts.