"an issue on" signifies: "an issue on The subject of" and therefore can only be applied when one can insert the phrase "The subject of" following the "on", while "a matter about" can utilized just before just about anything. This could be mentioned to a member of the family or 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