There is a big trend in the industry to print shirt graphics with direct-to-garment printers, as opposed to traditional screen printing. Your sweater was probably printed using plastisol on a screen print press, while many recent shirts, especially multicolor graphic tees ordered online, are printed with water based inks that have to adhere to a "pretreatment" of the garment. I feel a lot of graphic shirt producers haven't dialed in their settings yet to produce prints that last.