This adorable, but it is not factually accurate. I've been binge watching a lot of historical clothing videos because I am a nerd. I have recently learned this little pocket was added to early manufactured pants in the 19th century as a holster for a pocket watch. As pocket watches gradually became less popular, manufacturers didn't bother changing their jeans/pants patterns, and now it got grandfathered in, but I suppose a picture of a kitten is a worthy use of the pocket because watches help you tell time and it's always kitten time.