As the other reviewers said, order up a band size.  I wear the 34I in the Fancee Free Extra Support Nursing Bra, and the 36I fits me perfectly on the tightest hook.  This sports bra is very supportive and comfortable - I had little to no jiggle, and didn't have any trouble fitting into this sports bra.  I'm also glad it didn't have any underwire or other complexities, just a good fit.  It held the girls in place through a cardio/strength/stretching routine.  Highly recommend.