You don't need a cushion for your Chiavari Chairs, but I highly recommend one. Not only does the cushion make the chair more comfortable, but it also has a design element because it breaks up the color of the chair and makes the whole package more visually Interesting.
A Mahogany Chiavari Chair with an Ivory cushion put next to a table with an off white linen is much more visually appealing than a chair without a cushion.
And yes, having a cushion requires some maintenance work for cleaning, etc, but this is just like any linen in your business. Your clients will expect clean cushions. Also, our cushions are double sided, so if one side is dirty, just turn it over and use the other side.
To help with maintenance, our cushions have a stain resistant finish to repel stains and you can easily wash them in warm water with normal detergent and a normal washer and drier. And, our product is sewn well to hold up to commercial use.