Funcom Community Manager, Glen 'Famine' Swan, addresses the issue surrounding some Age of Conan players noticing an in-game breast reduction:
Funcom can confirm that some of the female models in the game have
had the size of their breasts changed. This is due to an unintended change in data that was introduced in an earlier patch, data which controls the so-called morph values associated with character models and the size of their respective body parts. We are working on a fix for this and your breasts should be back to normal soon.
The plastic surgeons of Hyboria apologize for the inconvenience."