Can't they at least eat the whole of one sweater before starting on the next? I've lost two sweaters to them this year, and a third has only narrowly escaped ...
Tasteful embroidered patches? Time to break out the mothballs! Here's a site which has a recipe for home-made moth repellent which wont smell bad: www.care2.com/greenliving/ask-annie-moth-ball-alternatives
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Maybe you should get a moth trap?