I always wear Wacoal bras. When I measured myself, the size was not what I was currently wearing at the time, but I followed the chart and got a perfect fit.
They work for me because I am petite with large breasts that are high in my chest. I need underwire. In other brands, the wire pokes my underarm area. I have scars from years of rubbing. Wacoal bras never do this. The wire is not placed too high on the sides.
If you know your size that fits, check on Zulily from time to time. They sell Wacoal for 50% off. The larger cups sizes seem to sell out fast. I stock up then.