How to fasten Japanese men's underwear?

Wrap it at the bottom first, pull the front one,

Wrap the back around the front.

At this time, the front one entangles the back one from another direction, and it becomes a T-shape.

One in the front and one in the back.

Turn the front end to the left (it will be very firm) and finally tie it to the left waist with the back end!