Question: what is the difference between bra size 34b and 34d?
Answer: The difference between 34B and 34C is one inch. Between 34C and 34D is another inch. It means that if you measure your chest right below the chest you'll be 34 inches. ... So someone with 34B has a circumference of 36 inches over her breasts and someone with 34D will be 38 inches.