Bodies inevitably change over time, making bras that once fit perfectly no longer sit on the body quite right. Whether it’s an issue with the band or the cup, there are ways to make the adjustments yourself. Cloth Habit has fantastic visual guides in their “Bra-making Sew Along” series of blog posts that show us exactly how to go about adjusting bras.
Band adjustment: http://clothhabit.com/2013/01/bra-making-band-adjustment/