Shooting with performing Artist Adele Metamophose.
Presenting here burlesque/strip number where she is... a lamp.
"if I have to be objectified, then I will decide which object I am. I'm a lamp"
I found it brilliant.
Light source, as you suspected IS in her hat. I honestly don't recall any extra source in this particular pic.
I'll give you points for being bang on the brief. I feel like the pose could be better.