When I think of something that is a "good design for all" it would have to be wayfarers by ray-ban
They have a sturdy plastic frame that no matter how many knock-offs are made, they cannot stand up like these shades do.
Their style works with many different fashion styles, and are the accessory that works with just about any outfit.
I have two pairs personally, and I would not trade them for anything... Unless it was for a million dollars, then I would use that to buy more... a lot more.