Wearable medical devices and systems comprising the devices are provided. The devices and systems find use in monitoring and/or modulating the health of a wearer. The wearable devices may be personalized to conform to the external surface anatomy of the wearer and comprise one or more functional elements. The functional elements are positioned within the wearable device so as to maximize alignment or interaction with functional elements in one or more implanted medical devices or one or more internal anatomical features. The devices and systems find use in the delivery of health care.
