Q: What can I wear with a light blue coat?
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1.When I looked at the coat, I immediately thought that black and a shade of blue would surely go well with light blue (Henri Matisse Rule).

So, my advice is to wear the coat with a dark blue sky sweater and black jeans. In my experience, when you combine like this, the coat would match the blue sweater to perfection.
2.There is another way to rock the coat to perfection. You choose a gray top instead of the dark blue sky sweater.

3.You can wear it with white cropped pants and a white top.