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so bra strap is nipples? lol..cool
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Nope, it depends on your breast size. Backs are flat and breasts are not. My hair is just now reaching my nipples, but it was bra strap a long time ago in the back and in the back it's currently 1-2 inches from waist length. (but nipple length in front) I hope that makes sense.
ex: An A-cup sister will be nipple length long before a D-cup sister /images/graemlins/grin.gif of the same height. (the hair has a bigger hump to get over to get to the nipple)