I wonder if anyone can help, ideally quickly as I'm hoping to get into town today.
DD is 11. I've measured her using the bra intervention technique and she measures 26" under the bust but 28" when she lets it all drop forward (iyswim). This would technically make her 26B, which is a bra size I really don't think anyone makes.
I think you wil find that what are called "trainer/pre teen" bras are not cup specific in sizing . Having been through this with my own daughter not so long ago, we found that these sort of bras were best until she had developed a bit more. M and S had a good range I recall ?
Thank you for this advice - you're absolutely right, nowhere seems to do a 26" back. I found the selection in M&S slightly bewildering and they didn't have anything in her size anyway (mid-sale) so I think I might order a couple of different options online and let her try at home.