I had to bring this thread up again because I just thought about it. Since I don't wear a bra I think it is the reason why it has been so hard even knowing where my bsl is. And again every other length is determined by a body part, I don't see why this one was made to be different. and the other point is that back in the day all the bra straps fell at the bottom of the shoulder blade. But still it is a body part and therefore should be used. Everyone take their clothes off to determine every other length but that one, they put their bra back on to check for that one which is crazy. lol