Depends on the occasion of the dinner - if its casual - a simple jean/top is good. But if its an occasion - I would go for a dress or something elegant. Movies - jean/t shirt or skirt/top or a simple tracks will do too Long trip - depending on the weather. Loose airy for summer, Warm snuggly for winter. Jean is best for long trips as you can mix and match and its less baggage to carry around BTW - you are from Vienna?