How do you make the hat transparent but show the parts that are colored in? I was trying to figure how to make this black part on the head transparent and the one that isn't black not transparent. This is 2.80
If you use Cycles and the black parts in a Image Texture, then you can use Mix Shader to use transparency.



The other way (with Image Textures) is just using Transarency of the Image (png file with transparency e.g.).