We all assume that you are talking about a Traditional belt worn with the Kilt that has a separate buckle on a belt with a smaller section with holes put through a buckle inside the belt for adjustment.
This style of belt is called a "Waistbelt" and the buckle is called a "waistplate".
The two leather loops on the Traditional Waistbelt are called "Keepers".
The one on the side next to the buckle are to keep the two layers of belt together and neat.
The one on the other side is simply for symmetry.
Here is a picture of a Waistbelt and Waistplate worn with the USMC Dress Blue uniform.
Please note that the belt is worn at the natural waist and outside of the other clothing.
This is how the original Kilt Belt was worn.
By looking at this photo you can see that the Waistbelt, when worn this way, does not need or go thru the loops on the back of the Kilt.
Those loops are to keep the sporran strap from falling off your hips.
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