It's the larvae rather than the moth that cause the holes.
They thrive on natural fabric such as wool, cotton, feather, linen, leather etc., but it's little flakes of skin and sweat that actually attracts them, so always wash before storing.
They like dark places, so make the most of summer to hang clothing in bright sunshine to dry rather than using the dryer and if you have anything that is particularly valuable put it in a plastic bag and store in the freezer for a few days.
This will make sure the eggs are killed off.
They are difficult to get rid of, but get natural fabrics clean and in the sun, which is easy at the moment, and this will help a lot.
Don't forget, woollen rugs and carpets will harbour the larvae too, so shampooing and hoovering these helps too.