At first, it was all just bullshit. Hand sign is a diamond, which is a sign of wealth (DDP wassup?) and saying you are got is some De Swag type shit.
Now, I'm pretty sure all the t-shirts and shit are deliberate. Ways of getting attention.
http://www.youtube.com/v/POB407UoI18
^Dope as fuck Jay Z Illuminati diss song [Dont ask how link got so fucked up]