Comment by Rotdhizon

This is similar to how traditional Afghan pants are tied. For those who have seen then, the first time putting them on can be a shock. Because when fully extended out, the waist is like 75-100 inches around, you'd think there was a mistake but that's how they come. You tie the drawstring like this so you can pull that waist all the way in comfortably and it lets the pants be very airy, comfortable, and cool.