What Mom did was really simple. She sewed washers to the back of the flag! Since the flag weighs more than it did, the wind won't blow it away. (Beat that wind!!!!)
Here is a washer on the back of the flag.
Mom used large 1" washers, and put 6 of them around the hem of the bunting.
Since the washers are on the back, no one can see them.
Happy Flag Day