This pack requires OptiFine to work.
Slimes with hats is a texture pack which takes advantage of OptiFine's cem properties and adds villager hats to all slimes and magmacubes.
[Disclaimer]
As this pack is subject to optifine to work, is recommended to play on full OptiFine versions to experience everything the project has to offer.
Pre versions of Optifine might have non-implemented properties which may cause unwanted visual errors.