Before magane4989's tweet, this sweater was shared by Japanese cosplayer Noraneko (のらねこ) under the term スケベニット (Perverted Knit) with this tweet in June 2016. The corresponding tag on pixiv only received about 30 uploads prior to its boom in popularity when magane4989 named it thus.
このセーター・・・エロい 童貞殺すセーター
This sweater... is erotic A virgin killer sweater
Also called 例のセーター or that sweater as with the open-chest sweater, albeit to a much larger degree in comparison with the latter.
Not to be confused with the virgin killer outfit, despite them sharing the same naming inspiration.
