Which item is specified as part of the official dress for girls to wear on top?

The official dress code for girls in FFA includes a white blouse as an essential component worn on top. The white blouse symbolizes professionalism and unity among members and is part of the organization's tradition of maintaining a formal attire that reflects its values and spirit. Wearing a white blouse helps to create a cohesive appearance during events and activities, such as competitions and conferences, distinguishing FFA members and fostering a sense of belonging. This emphasis on a white blouse maintains a standard of dress that aligns with the organization’s mission and goals. The other items listed do not meet the specified criteria outlined in the FFA dress code, which emphasizes the importance of professionalism and uniformity in attire.