a young couple both wearing white shirts and blue jeans standing in a light misty rain
A matching couple cools down in the rain.
The couple cools down, but not all people want to be in the rain.
Not all couples who both wear white shirts and blue jeans mean they are matching. Just because a couple stands in light rain does not mean they are trying to cool down.
We don't know whether the couple cools down in the train or is just standing in it.