|I see a consistent problem with shoulder line lengths. For most ,it is WAY too long causing a very sloppy look. Find a top or cardigan that fits you well . The armhole seam should sit on the crest of the shoulder.
Measure it and keep it for future reference. When adjusting pattern, you can cut off the excess remembering to leave the seam allowance. In alot of cases the sleeve will still fit but check by measuring. Usually, the sleeve has 3/4 inch or more of ease, for wovens.In the industry, we did not use any sleeve ease on knits so I don't either.
UPDATE- When taking body measurements, a short necklace is worn as a reference point. One measures from there to get accurate shoulder, center front and back meausrements.
An other meausurement that I encourage students to take and use it the back shoulder tip to shoulder tip measurement. This is an easy measurement to take yourself and it helps a great deal when altering a pattern.