This book is old, 1992, but still rings true. Sienese women seemed to be even better dressed than the Florentines, if that is possible.
Things I noticed about Italian women on my last trip:
1. Radiant, natural skin (no facelifts or breast augmentation for that matter, either!)
2. Curve-skimming feminine clothes, not terribly trendy
3. A few classic high-end accessories (knock-offs ok, too)
4. Scarves, scarves, scarves
5. Glossy, well-cut hair with subtle highlights if any, longish
6. Heels!
7. Great leather items
8. Ironed clothes and polished shoes
9. Killer shades
10. Natural makeup