Bra size 32AA, very petite build. PS suggested 160cc - 180cc. What will get me to a small B cup?

Hello and thank you for your question.  The
best advice you can receive is from an in-person consultation.  The size, profile, and shape of the
implant is based on your desired breast size/shape, your chest wall
measurements, and soft tissue quality.  This decision should
be based on a detailed discussion with equal input from both you
and your surgeon.   Make sure you specifically look
at before and after pictures of real patients who have had this surgery
performed by your surgeon and evaluate their results.   The most
important aspect is to find a surgeon you are comfortable with. I recommend
that you seek consultation with a qualified board-certified plastic surgeon who
can evaluate you in person.
Best wishes and good luck.
Richard G. Reish, M.D.  FACS
Harvard-trained plastic surgeon

At
size 32, each 100 cc of implant corresponds to 1 cup size change.  160 cc or 180 cc implants would take you up about
2 cup sizes to a large B or small C.  Best Wishes,Gary Horndeski, M.D.