Launching Minecraft with illagersweararmor and no other mods installed crashes the game. To replicate just place illagersweararmor-1.20-1.3.2.jar in the mods folder and launch the game and it'll crash.

Please send the crash report for further diagnosis

OK I did the exact thing you said in this issue and literately no crash happens so I'm gonna have to close this issue for now until more info is provided

Forge 47.2.20