Start by placing 1 drop of each oil onto each cotton ball.
Add the dried rosemary and the dried lavender evenly into each bag, about 1 1/2 teaspoons each. Add 2 cotton balls with essential oil to each bag and close tightly.
Hang your bags from coat hangers, add to storage chests, place in linen closets, and anywhere else you need to repel moths.
Notes
You can reuse the bag and refresh the ingredients twice a year when you are putting away your summer clothes, winter clothes, and seasonal linens.