Typically I measure between 34B and 34C. For some brands I prefer
36 band for more comfort (soma). I originally ordered 36B, but exchanged for smaller sister size 34C because I actually needed the tighter band.

If anything I found the band to run a tad bit larger than expected and the cups to run a tad bit smaller. However, I have a similar maidenform bra, but with regular straps and back closure and the sizing is exactly the same. For me these are the most comfortable bras. They offer great support and shape. I love that the underwire doesnt come up too high and that the cups lay smooth.