A 32 band does most of the work — around 80% of your support comes from the band, not the straps. If it rides up at the back or the straps dig in, the band's usually too loose or the cup too small.
We stock a 32 across the full cup range — 32D to 32K — graded for fuller busts. Not sure of your cup? Book a free fitting and we'll get your 32 sorted.