If you lose some weight, you may need to add another notch to your favourite belt in order to make it fit correctly. It can be easily done with a leather hole punch.

Silverline 200111 2-5 mm Heavy-Duty Revolving Punch Pliers

Put the belt on, inside out. Tighten it to where you want it to be and use your pen to mark where it stops.

Lay the belt down on a flat surface, back side up. Measure how far apart the pre-cut belt holes are so you can place the new belt holes correctly. It will look better if you put the holes up to the closure point. If the new spot isn’t exactly on a measured place, create a hole slightly beyond that point.

After checking your marks one more time for accuracy, put the belt in the leather punch tool. Lining up the cutting point and the hole, squeeze   the tool as hard as possible to punch the hole. You may have to open and close the tool a few times to cut through thicker leathers.

After cutting the holes, wipe the excess leather off and try the belt for size. Make sure the holes are big enough so that the buckle prong can fit through completely.