12yo DD is probably a 30DD/E or equivalent. We've made do with at-home measuring an bras from M&S up to now, but they're not giving her enough support and she's already grown out of the ones we bought a few months ago poor thing, I feel she's going to take after her well-endowed aunt!.
Has anyone taken their daughter for a fitting at Bravissimo or John Lewis? I used to go to Bravissimo before I ditched the bras in menopause and found their fitting good, but never found the bras that comfortable. And I don't remember them having a good range of non-wired bras (I don't think she's ready for underwires yet!). JL is much more of a trek for us, but I'm wondering if it's worth it as they'd have a better selection? She needs everyday and sports bras.