After My interview with my customer, I will stick to my original idea but It will have more features than just a regular umbrella. The front part of the shoulder straps will have pockets: one where a cell phone can be charged, and one to put wallet and keys. The back will look like a backpack with solar panel to recharge the lithium battery while not in charge by conventional means.
The umbrella will have an automatic opening and closing system that can be activated by the press of a button in the front.

I have also put below a gif of the prototype through sketchfab