This drying process will work for any variety of green bean that you raise in the garden. Wash and dry the green beans, snap off the tips and string as you normally would. Don't break the green beans up, leave them whole. Cut about a six foot length of the cotton sewing thread, thread your sewing needle, pulling the loose ends evenly together and tying an extra large knot in the end of the thread.
This will give you about a three foot string to work with, but you can make it longer or shorter to meet your needs and the circumstances where the beans were to be hung. Sticking the needle through the middle of each bean. I don't mean down the center of the bean, just through the center, so both ends of the bean are loose. Fasten the first bean by wrapping the string around it and making a knot so it won't pull through. Then go on stringing till your string's full. Fasten the last bean the same as the first one
Our house had three porches but we always hung them on our back porch. The beans will become dry and wrinkled in a few days - my mother took them down when she wanted to prepare them for a meal.
Leather britches were a winter meal at my mother's table. Mom would take several strings (there were nine children in my family) for a large kettle and remove the cotton strings. She would rinse well - let them soak overnight - drain off the water in the morning - add fresh water and then put them on to cook.
When they boil up once, Mom would pour off the first water to be certain they were clean and also to remove any bitter taste and add fresh water again. Then Mom would toss in a ham bone, maybe a strip of beacon and an onion (to keep the beans company) and salt and pepper to taste. She cooked until tender and served hot.
I learned to love my mother's leather britches as a little boy - they were a mighty fine cold weather dish that stuck to my ribs. Today, my sister Johnnie and brother-in-law Myles puts up leather britches and gives us several messes (all true southerners know what a mess is) throughout the year; my wife, Tressie cooks them just like my mother. I am a blessed man!