In a nutshell: “Left over right, under both. Right over left.”
Detailed — Find the center of your belt.
Place it on your navel and take the sides behind you, crossing them and bringing them back to the front. Make sure they are even lengths.
Then cross the left over the right. (Double belt wrap not shown here.)
Tuck the left strap under both layers of the double wrapped belt. (Which is still not shown here.)
Then place the right side over the left (the same strap previously used)
If you have a stripe, it should hang on your left side.