During this time, a girl may begin to wear a training bra in preparation for continued breast growth.
Girls may rail against this, but a training bra does not require fitting so there is no need for an individual trip to the lingerie store.
When everyone is participating in a clothing exchange, however, and the free training bra is coming from an unknown source, it's much more palatable.
If your daughter has a particular need -- if she is plus size, for example -- this can be a good source for posting a request for a training bra someone has outgrown.
Be sure and offer the training bra on the site again when your daughter has outgrown it.