It is worn starched. It is the shirt used in shows. For everyday riding a normal long or short sleeve shirt will do. Chaps are made of leather and go over jeans to protect legs from brush, ropes, and fences. They are generally loose fitting and wrap around the legs.
Some popular styles are shotgun, batwing, chinks and wollies.
Chinks are knee length and warn in warm weather. Wollies are made of fur and worn for warmth. Is worn over the shirt to add warmth. A popular vest is blue denim. The bandana is tied loosely around the neck.