Formal fragrances for women tend to feel polished, composed and a little more distinctive than everyday scents. Expect floral, woody, amber or musky notes with a smoother finish, giving enough presence for evening wear, dinners and occasions where you want a more refined impression.
If you prefer fragrances that feel neat and well put together rather than overly sweet or casual, formal styles are a good place to start. They often balance softness with depth, so they work well with tailored outfits, special events and settings where a more considered scent feels appropriate.