Hair Attachment is available for any hairstyle that has attachments like Elastic, Ribbons, Hair Clip etc. Not all hairstyles has attachment. Some has only Fasten or Gem while another will have both.
Fasten
Color: Change the fasten color.
Surface: This is responsible for the Surface Properties of the fasten. There are 10 properties in total; Matte, Silk, Shiny, Metal, Glossy 01, Glossy 02, PVC, Matte 02, Velvet, and Satin. Each one is the combination of Metallic, Specular, Specular Tint, and Roughness at different values to give desired result.
To change influence: Hair ‣ Properties Editor ‣ Object Data Properties ‣ Color Attributes ‣ Fasten
Gem
Color: Change the gem color.
Surface: This is responsible for the Surface Properties of the gem. There are 10 properties in total; Matte, Silk, Shiny, Metal, Glossy 01, Glossy 02, PVC, Matte 02, Velvet, and Satin. Each one is the combination of Metallic, Specular, Specular Tint, and Roughness at different values to give desired result.
To change influence: Hair ‣ Properties Editor ‣ Object Data Properties ‣ Color Attributes ‣ Gem