You have to clean EVERYWHERE - really good hoovering with the best nozzle for the job, if you have a bad hoover, borrow a good one.
They live in dark, undisturbed places, the lower the better for them. This means the cracks between skirting and floor, the corners of drawers and wardrobes: clean all these out with the most toxic cleaner you can stand, then wipe them over with a solution of essential oils.
Remove all clothes with signs of munching. You'll see a sort of tiny tube or cylinder, often the same colour as the fabric, because the larvae eat the clothing and make their tube out of the resulting debris. There's also often a gritty sort of stuff, semi-stuck to the edges of a hole or in the ribbing of a sweater. Moth eggs are a dull greyish brown and feel like sand.
If it's something precious and just has one tiny hole and a bit of egginess, it's often enough to freeze/thaw/freeze after cleaning everything off, but keep woollens in vacuum bags in future. Moths are stupid and eat polyester fleece and acrylic as well, bag that up too.
Air the insides of cupboards, drawers and wardrobes really often, clean them far more than you think is necessary, and get some of the prism-shaped cardboard pheromone traps from ebay. Place low down in dark corners and aim to attract all the males to them so that the females have nothing to breed with. The main seasons for breeding are autumn and spring. This autumn we've had hardly any moths after about 3 years of the above, and my traps are empty at the moment (but spring is worse here, the eggs are often dormant over the autumn/winter because my house is cold).