common clothes moth
Refers to the species Tineola biselliella, a small moth whose larvae feed on natural fibers such as wool.
The larvae of the common clothes moth made holes in the sweater.
Katakana spelling is common for this insect name; usually written in kana.
Kanji spelling is rare; the word is usually written in kana.
The name コイガ is a compound of 小 (ko, 'small') and 衣蛾 (iga, 'clothes moth'). The exact historical derivation is uncertain, but it follows a common pattern for naming small moth species.