Head Accessory that Doesn't Affect Hair Mesh

I know that Sims 4 Hairs have different meshes for hats so that clipping doesn't happen. If I am making a head accessory that isn't a hat though, what setting do I change in the Studio (I assume the Warehouse tab) to ensure the hair doesn't react as if there is a hat on it? I know that you're supposed to start with the closest thing you can find to the thing you are trying to make but I don't see any non-hat head accessories that are base game that I could start from.