I was the Barbera showroom the other day and Michal showed me the most perfect blazer/sweater/coat/jacket thing. A cashmere/wool ribbed knit that wears like a sweater but fits like a jacket. This jacket was one of his top sellers for Fall 2005.
If it is at all above freezing outside this would be my first choice.
I love how Michal adds his own sprezzatura with the attitude he gives the tie.