1. The problem asks to add the best topic sentence for a paragraph about the Scottish kilt. 2. A topic sentence introduces the main idea of a paragraph. It should summarize the key point that the paragraph will explain. 3. The paragraph describes how the traditional Scottish kilt has changed over time, from a long piece of cloth to a shorter skirt worn at special events. 4. Therefore, the best topic sentence is: "The traditional Scottish kilt has changed over the years." This sentence clearly introduces the main idea that the paragraph elaborates on. Final answer: The traditional Scottish kilt has changed over the years.