To quote the Aesthetics Wiki, Ethereal fashion is an aesthetic based around the feeling of being extremely delicate and light in a way that seems not to be of this world. In fashion that means romantic, delicate, lace dresses with "diamond jewelry, clear accessories, angel patterns, pale colors, white fur, drop earrings, pleated skirts, white mesh, etc." It's very beautiful and feel slightly retro or even antique. Maybe something that angels would wear?
