Where is the best place to get a teenager measured for a bra?

[Hickorydickory12]

Dd is 15 and very slight but is starting to develop a bit more and I want to get her measured properly for new bras, and set her off on the right road to bra wearing!
Anyone help?

The best bet if she is very small is probably john Lewis. Have you seen the better bra campaign fitting guide? You could do that so you know her approximate size. It means you will spot straight away anyone using the old plus four approach. Please don't take her to marks and Spencer