This is a mod for Team Fortress 2 that removes just about all of the cosmetics from the game to remove visual clutter and to give a bit more of an FPS boost for machines that desperately want to get more FPS.
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Download the mod from GitHub. It should be downloaded as a .zip file.
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Open the .zip file. Inside should be a folder labelled "No-Hats-Mod-master". Open that folder.
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Extract the .vpk file to steam > steamapps > common > Team Fortress 2 > tf > custom
You should now be able to boot into your game and have the No Hats mod loaded.
As of December 2018, I will no longer be maintaining this mod.