As someone has already been said, a traditional wide kilt belt is only really necessary with a Montrose or similar jacket. I wear a normal jeans/trousers belt most days to carry a bag, as opposed to wearing a sporran around the house; but a kilt should not ever require a belt to stop it falling down, that is what the adjustable buckles are for. If it needs a belt then you should be adjusting the buckle/strap positions (as many of us have had to do over the years) or buying a different size.
If you are going to do it, do it in a kilt!
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