Question:
First question: should your belt match your shoes? Second question: Can I wear light brown slip on shoes with dark blue pants?
Answer:
For Question One:
Always match the color of your belt with the color of your shoes. That is, brown shoes with brown belt and black shoes with black belt. If you are wearing light brown shoes, then try to ensure that your belt is also light brown too. It would look well-coordinated. You can refer to Coordinate Dress Shoes regarding matching against your dress shoes.
For Question Two:
It is definitely fine to wear light brown slip ons with dark blue pants. Just take note that wearing such light brown shoes means that you are going for an informal style. The lighter the color of your dress shoes, the more informal it is. Try to coordinate the color of your belt to the same shade of brown as your shoe. Probably when you look down at your shoes it might seem uncoordinated between the dark blue pants and the light brown shoes. But I can assure you that it is absolutely fine and many European men are wearing this style nowadays. They look very good in it as a business casual style.
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