Seemingly complex costumes can be made by putting unusual pieces in unusual places. A bit of shading can also help add depth to the details. My method for this is to start with a darker color (for shadows) and add a brighter color on top (for highlights). The majority of lighting is done subtly, trying to transition from shadows to light in a way that simulates volume. Highlights and glare should be much brighter, but I’ve found that this usually requires extra layers.