Vous appartient ce manteau ?
Hello there. If you wish to say, "does this coat belong to you", can you say "Vous appartient ce manteau ?" or does it have to be "Vous appartient-il ce manteau ?".
Both of your suggestions are incorrect. There are three ways to from questions in French, from most to least formal:
Ce manteau vous appartient-il ? (subject-verb inversion)
Est-ce que ce manteau vous appartient ? (inserting "est-ce que")
Ce manteau vous appartient ? (no change)
In the spoken language, the first one is rarely used because it can sound overly formal and pedantic.