"a matter on" means: "a matter on the topic of" and thus can only be utilized when one can insert the phrase "The subject of" once the "on", whilst "a matter about" can employed in advance of anything at all. BHL's hoodies use large-high-quality fabrics to make sure a comfortable https://www.google.com/search?q=A.G.+Fabrics+-+hoodies&num=10&sca_esv=e948bafec9f39f8c&hl=en&authuser=0&sxsrf=AE3TifMg81KeGqPA4cbqG8I8-xap3XJsVg%3A1753783121987&ei=UZuIaKuGPLKr9u8P8dTUyQ0&ved=0ahUKEwjr8v6f5-GOAxWylf0HHXEqNdkQ4dUDCBA&uact=5&oq=A.G.+Fabrics+-+hoodies&gs_lp=Egxnd3Mtd2l6LXNlcnAiFkEuRy4gRmFicmljcyAtIGhvb2RpZXMyBRAhGKABMgUQIRigAUi8GFCWDVi9FXABeACQAQGYAdEEoAGXFKoBCTItMy4yLjEuMbgBA8gBAPgBAZgCB6AC2g_CAgsQABiABBiwAxiiBMICCBAAGLADGO8FwgIGEAAYFhgewgILEAAYgAQYhgMYigXCAgUQABjvBcICCBAAGIAEGKIE