So you would love to build your own smart wearables? Adafruit has shared a guide that shows you what it takes to build a wearable computer with Raspberry Pi. PiGlass is capable of capturing video and photos and uploading them to Dropbox via WiFi.
You can stream music to the device from your phone over Bluetooth. You are going to need a Pi Zero Spy Cam, Pi Zero W, Bluetooth dongle, VuFine+ wearable display, and a few other parts to complete this project.