Pleats are a great casual/dressy style. You could have a long, baggy dress with no shape to it, but then with pleats it is completely different. Pleats add a bit of a bounce and swish to the dress with each step you take. Some pleated dresses have the pleats on the chest area as well as the bottom half. This is perfectly fine and continues the flow of the dress. Small pleats or large pleats, either or are fine. Some super small pleats can't even be seen unless you touch the material or get close enough to notice.