In general, Europe is more formal than the United States, but use your best judgment. A dress shirt and tie would look just as good as a sport coat and dress shirt, so if packing light is your concern, that would work and a tie certainly takes up a lot less space.
On the other hand, if you're the sort of person who might wear a jacket on multiple nights, you might get enough mileage out of it for it to be worth packing. At the end of the day, it's your call.
Comments
In general, Europe is more formal than the United States, but use your best judgment. A dress shirt and tie would look just as good as a sport coat and dress shirt, so if packing light is your concern, that would work and a tie certainly takes up a lot less space.
On the other hand, if you're the sort of person who might wear a jacket on multiple nights, you might get enough mileage out of it for it to be worth packing. At the end of the day, it's your call.
I hope this helps!
-Tim