There’s no telling what Aleister Crowley would think of this “Thelema” t-shirt, although I suspect it wouldn’t be pleasant. Wearing an enormous Thelemic pentacle seems to go against the principles of silence espoused by most magical traditions, and depicting Crowley invoking the sign of silence just beneath it doesn’t help matters much.
Still, if you’re more interested in the aesthetics of the occult rather than its practice, you could find worse looking t-shirts. Grab one at Black Sanctuary.
Via Hermetic Library.