How to deal with moths eating clothes?

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Title explains it really. I've just sorted out dd's clothes to find a beautiful hand knitted jumper my mum made full of holes Last week DH chucked out two jumpers for the same reason.

What do I do - Moth balls? Anyone got any product recommendations?
Is it only knitted stuff they eat?
Is it better if the jumpers are hanging up rather than in a drawer?

I have no experience at all of it! Thanks for any advice.

Lavender bags.

I hate to say this but I've read they are notoriously hard to get rid of and that moth balls and lavendar don't make a lot of difference. I think you can get people in to treat the house professionally.

you need chemical treatments that contain Transfluthrin. It kills the eggs and the grubs as well as the adults.

It is not a persistent chemical and breaks down in sunlight, water and fresh air, so it is available in small hangers that you put in each drawer, box or wardrobe.

I get mine from Robert Dyas, there are several brands. Most of the hangers will treat half a cubic metre of space, so see how many you get per packet.

As a quick fix, put all the clothes through a hot tumble drier to kill eggs, but you must then put them in a box with Transfluthrin as they may get reinfested within a day.

You need to empty, hoover out and wipe in, around and under all your wardrobes and drawers.

Bleach and detergent do not kill moth eggs.

Hoover the carpets very frequently, especially around the edges and under furniture.

Rentokil do an excellent and odour free selection of products to prevent and kill moths for use in the home. Don't bother with lavender or other natural remedies, they don't work. Hoover the inside of the wardrobe and drawers before storing freshly washed/ cleaned clothes with one of the products from Rentokil.

Thanks so much. It will be a good incentive to clear out our overflowing wardrobes...

Never had moths in the house. Spiders wasps, flies, but tend not to leave windows open at night in the summer, as am allergic to gnat bites.
Had some clothes in the attic, and my cashmere seemed to be a delicacy of mice? Or I assumed it was them.