Choose a size based on your body measurements: bust, waist and hip width. The top’s length is not all the way down to the hip but almost. The pattern is designed for a woman who is 160-172 cm tall. If you’re taller or shorter you may need to lengthen/shorten the top (see Sewing Instructions).
B cup is assumed for all sizes. In the Sewing Instructions you can read about how to determine your cup size in sewing (not the same as bra size), and how to modify the pattern to fit your unique body.