Before children I usually wore a 32C bra. I am 5'9'', weigh 9 stone, and have small (not minuscule but definitely smaller than average) breasts. After breastfeeding I feel that the same size is too tight, so bought some 34Cs and 34Bs but they don't fit right either. Using the booborbust calculator I should be a 30DD. But although I can do a 30 inch strap up I find it extremely tight and uncomfortable. My underbust measurement is 29. What am I doing wrong? I literally no longer have any bras that I feel comfortable in, even sports bras! Is it some sort of hypersensitivity thing? Anyway, I haven't been wearing one very much this summer, but now I am back to work, need to wear a blouse or other smart-ish but light top, and definitely need a bra underneath. (After breastfeeding alas I have huge nipples.)