I measured myself and got 39 inches, so per directions, went up to 40.  There's a 4 inch difference between my highest measurement which is equal to a D.

Got the bra today.

The bra does not lie flat against my chest i.e. the center bone sticks out a good 2 inches.  Have tried adjusting the strap to thelowest level....then tried going up three.

Still a gap.  Can anyone tell me why.

The fabric is HOT!  should, I think, be made in cotton rather than the nylon/polyester blend it comes in.

I'll wear it..,...,but think just an overthehead champion is more conducive to my needs.