one of the best books on Italian armies of the 18th and 19th century and their uniforms is:
GLI ESERCITI ITALIANI DAGLI STATI PREUNITARI ALL'UNITA' NAZIONALE. ROMA, RIVISTA MILITARE 1984.
The book has about 400 pages filled with colour drawings by various Italian artists. You can only get it used and it is quite pricy, but it is worth every Euro you pay for it!
The following link will show you some of the pictures you can find in this book: http://www.colligite.net/alpini/prgibellini.html
Wow, thanks everyone. Yeah, I put suggestions up on Osprey's site about book ideas for the Italian Wars of Independence a few months ago, but I don't know if they were accepted. But I will definitely check out those books recommended.
You are right. It is a collection of some issues of "Rivista Militare". It is expensive but the quality of the book and the pitures are just terrific!
I got my copy via "mareganum.com" - a web-side of Italian bookshops. Maybe you can find it there.