I don't know. I know I have three bras that my hair is definately top of braclasp. But I have a few that sit on my back at 26 and 27 inches.
Here's how I started thinking about my hair. I am 5'7inches which is 67 inches. 33.5 inches is exactly 1/2 of my height. Waist length is 29.5 inches. 33.5 inches is right at the tailbone just above my butt.
Now at 26 and 27 inches I'd still be in the braclasp territory, but it would be lower-near the waist range.
There now that I've out explained myself, see if you can figure that one out.