You need to install the whole mod (except for stylesheet_categories_dressing.css in your case), because the other files give unique class names to elements and stylesheet_chcategories_dressing.css can't affect elements without those classes. You can disable or not use any features you don't need.

"Magnets" is

Magnets-> (1) [top category]
→ Inspire Magnets
→ Faces of Faith Magnets (1) [subcat]

The Faces of Faith / Magnets wraps due to length and looks like two categories.