Eloise's fit advice: If you have a size range that you usually go by e.g. 32DD or 34D, opt for the smaller back and the bigger cup / 32DD. However, if your breast tissue is quite full on top [you often experiece 'double boob' under tops], take a cup size up, but stick with the smaller back i.e. 32E if you typically go for the range above. The eyelash lace overlay has no stretch so will cut on a firm top bust.