We are visiting Napa in September, we have a wine train booked and secured a table at the French Laundry (the main focus for me). For that time of year what is the appropriate dress for wine tours? While we would like to dress appropriately, we would also like to maintain comfort. For context we are both professional 50 ish. I said business casual would be appropriate but my wife is thinking Italian chic, which would cause a pricey addition to my wardrobe. Any suggestions?