Summer Fashion Trends 2010 For Teens - Tiered Skirts. Tiered skirts are very popular this summer and perfect for teen girls. They're flirty, girly and it's a look that can be dressed up or dress down depending on your style. I even love to wear mine as a cover up when I'm going to the beach or the pool. Tiered skirts work in any elements with heels, or flats and can easily become your staple item for summer days. Look below to see some of the flirty tiered styles.