The 'Cat Keyhole Lingerie' meme originated from a specific style of Japanese lingerie, characterized by its feline-shaped cutout over the bust, which gained massive viral traction on social media platforms like Twitter and Pixiv around 2016. What started as a niche fashion item quickly evolved into a popular 'outfit challenge' for digital artists, who began drawing their favorite anime characters and mascots wearing the distinctive garment. The meme is typically used to showcase character art in a playful, slightly suggestive manner or to mock characters who would look hilariously out of place in such provocative attire. Today, it remains a staple of internet fan culture, symbolizing the bridge between viral fashion products and online art communities.