You are not alone. Bra fit problems plague women worldwide. Though bra companies have the best intentions in mind, their methods used to determine bra size often fall short. Yes, the circumference of the chest and size of the cup are important to find a correct sized bra, but the actual shape of the breasts may help you more accurately determine the style/type of bra that best suits you. I know you have been told your size, 36C, but do you know your shape? There are 7 distinct breast shapes that will help you identify the style of bra that will provide the most comfort and support:
Round breasts have equal volume in all curves, like a ball or melon. Usually characteristic of smaller sized breasts but can be seen in larger breasts also. For this shape, not much support is needed and a lighter, unlined bra may offer adequate support. Also, no underwire is needed since breast likely does not need to be reshaped or lifted.