Unless I've missed it, nowhere on their shop page does it say that Jobs wore their turtlenecks, merely that he was a "fan" of theirs, and the Wikipedia fact is uncited (now marked as such).
"Jobs preferred $175 St. Croix cotton and microfiber mock black turtlenecks. According to Bernhard Brenner, the founder of Knitcraft, St. Croix’s parent company, Jobs bought about two dozen black turtlenecks each year."
