I actually think/know this will be VERY popular..
Most
Yankii boys & girls (high school yakuza wannabes) all dress now in blue "puma" sweatpants with "Hello Kitty" sandals, so this will not be a stretch at all..
Now, I'm not talking about a handful of young punk ass teenagers, there are TENS of THOUSANDS that wear this shit now.. It's almost a fuckin' uniform for them now.. (like most Japanese people with fashion, they have the mentality of sheep, and just follow the flock)