Kanye West -- Dope Sweatshirt Sells Out After Pap Photo

Kanye West can move product ... and he proved that with a single push of a button Thursday ... and a marijuana-fueled clothing company is reaping the benefits.

The always fashion-conscious Yeezus became a Pied Piper of sorts with the pic he snapped of a pap wearing a sweet sweaty. The manufacturer -- D9 Reserve -- instantly sold out ... more than 300 sweatshirts at $135 a pop. That's a cool $40K.

D9 is big in the weed scene, promoting pot in its fashions.

As for the sweatshirt, the company does not plan to restock, which will make the 300 instant classics.