Thank you for your question.
There are a few remedies that will kill the mothball smell. Airing the clothes out naturally is one. You can also put the clothes in the dryer on the fluff cycle with a dryer sheet to kill the mothball smell. If washing and drying the clothes doesn't work, you may need to have them dry cleaned professionally. Other remedies I have read about include sealing the clothes in an air-tight plastic bag with a deodorizer, such as a dryer sheet or some dried lavender. You can also try washing the clothes with a bit of vinegar added to the water.
There are many mothball alternatives. You can make a sachet and place a number of things in the sachet to repel moths, like dried lavender, cedar chips, dried rosemary, mint or thyme, or dried lemon peels.
There are many online retailers that sell lavender sachets and cedar sachets, and you can compare retailers to see where you can get the best price. Local home goods stores also sell these products.