I forgot how huge Woman Within runs!  They must have their own sizing system.  I have other cotton bras in 46C, my usual size.  I wanted a looser band for summer and ordered 50B (smaller cup size based on reviews); extra large, yes, but cotton will shrink a little. Laughable when I tried one on.
I like the plain front of this bra so no decorations show through T-shirts.  I'm making a free exchange to 48 A with high hopes.  $7.50 is deducted for shipping if you make a return.