The most important thing is that the belt fits your natural waistline. Some belts work with some garments and don’t with others. You can always have another hole punched if you’re a half-inch off somewhere (most shoe-repair shops can do this).
Finally, know that a belt will break up the line of your body. That doesn’t mean shorter girls can’t do it (I personally don’t think looking taller is looking better in the first place), but think about using a belt that’s a similar color to the garment.
Oh, one more thing! A belt is going to define your curves, so keep whatever you wear underneath your shirt or dress as thin (fabric-wise) and fitted around your hips as possible.
I am so glad I asked. I had no idea.
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