I am observing that passengers seem to be wearing the same clothes all year round - fairly light spring/autumn dress. If I run a service in Winter through Germany, with the landscape covered in snow, that means it's cold - and I wouldn't expect people to walk around wearing t-shirts. But I look outside and about half the passengers on the platform are dressed way too light - a miracle they haven't turned blue yet. It would be good if passengers could be dressed according to season and weather. Shorts in Summer, jackets and such in Winter, perhaps even break out the umbrella when it's raining. It would add to immersion and realism.