Honestly it's currently a three-way tie, all pictured.
PRIDE - obvious reasons I feel, but it was also provided by the, now defunct, CLG esports team after I'd done commentary on their short lived FGC events. I hold it close for the friend from that relationship that gave it to me.
HIMBO - The style is so strong with a baby blue color. All the "Barbie energies" put into a male- focused sweatshirt. My friend, TieTuesday, pointed it out at MAGfest and I instantly fell in love.
GODDAMN SUPERHERO - I like my "if you know it, then it's nerdy" shirts and this is multiple layers of lesser-known game (No More Heroes), and a semi inside reference in/around the game. But it looks great without any of the context and fits great as well.

