If you plan to use your belt as a tourniquet in an emergency, you'll need to have a hole in the right spot to fit your limb snug. amirite?

You've just started banging up haven't you?

You can tie most belts.

Nah, you route the belt through the buckle, reverse direction and tuck the tail between the belt and skin.

You don't need to use the fastener.
No belts have holes much beyond the waste size.

So you don't want to actually tie it. For it to be effective you need to leave some slack and use a stick or something to twist it tight enough to cut off blood flow. After that you can tie it somehow to keep the stick in place.

Or a knife

I have a ratcheting belt.