There is no better way to learn electronics than building and programming your own wearables. If cosplay is your thing, you may want to give this Motion Reactive Bunny Ears project from Adafruit a look. It was made with Circuit Playground Express. You are also going to need a Neopixel strip, LiPoly battery, and a few other simple components to get started.
The instructions for this project is available on Adafruit.