I need help in figuring out a pattern. I have a raglan sleeve pattern, which SHOWS the sleeve increasing out for the upper arm, but the pattern doesn’t say ANYTHING about what to do. It just has you cast on 48 stitches and work 15". Then Shape raglan top same as back. I know these 48 stitches are not large enough for the upper arm, but not sure how much to increase. Would anyone know? I’m not sure why patterns don’t have this kind of information. Thanks in advance for any help. I have the body of the sweater done.