Not an unreasonable suggestion. On the negative side, most of us have no idea of the correct size of a heapin' handful. 33B or 32C? We would probably have even more trouble with waist and hips.  

That's why I think TER should come up with a TER Certified measuring tool, complete with TER Logo. A tape measure with built-in three-channel recording device. An electronic scale (like a luggage scale) with a fitting to use with a hook or a strap to record (and automatically save) her weight. Built-in Bluetooth allows the automatic download of recorded data to your review-in-progress.

Alternatively, once the fields are created, the correct values can be updated by the Provider herself or a reviewer reporting her correct measurements from her websites.