|This tip is from Sandra Betzina and I teach it in my fitting class. When making a pattern for the first time, increase SIDE seams by an additional inch. Remember to add this to the sleeves seam as well.
On tops, after sewing up shoulder seams, pin baste side seams. make needed adjustments then sew (machine baste) and try on again. If it is a good fit, then permanently stitch. Remember to constantly fit-as-you-sew. This is the only way to get perfect fitting clothes. MANY, MANY students sew awaywithout a single fitting and then are shocked that the garment does not fit.
That is a waste of precious time. Proper fitting saves time and money. Best if you have a sewing buddy that can help you though. You can still fit yourself but it's more of a challenge. I fit myself and struggle...