Moth balls are made from Naphtha - you may find this a little hard to source HOWEVER there is some evidence that putting conkers (Horse chestnut seeds) amongst your cloths will deter moths.
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Actually Naphthalene, Naphtha is liquid. L
A reasonable alternative is to keep all woollen and cotton clothes in sealed plastic bags - as far as I know the moths haven't as yet found a way to open them.