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This datapack has only been tested on 1.20.1.
It shouldn't be necessary from 1.21.1 onward, as Simple Hats uses Accessories in those versions.
When using the Curios Compat Layer for Accessories mod, Simple Hats become unequippable in the Hat slot. This datapack restores their functionality by reassigning the correct Hat tag.
Accesories (required)
Curios Compat Layer for Accessories (required)