Girls' Generation is known for reinventing their fashion styles and stage performances throughout their career. In their early years, the group performed in uniforms; with the debut single "Into the New World", they introduced themselves as high school students. In 2009, the group set the "colorful skinny jeans" fashion trend with "Gee", and later opted for a marine-inspired image on wearing uniforms and shorts that highlighted their legs with "Tell Me Your Wish (Genie)". In 2010, the group's image became more diverse: they used a cheerleader concept for "Oh!", while the performances of their 2010 single "Run Devil Run" was noted for conveying a darker theme, which was billed "Black SoShi". Later that year, the group transformed themselves to Bond Girls-inspired singers for the visual of "Hoot". In 2011, the group established a "heroine" image, with members choosing their own outfits, emphasizing each of the members' own tastes rather than performing in uniforms. For the performances of "I Got a Boy" (2013), the members opted for flat shoes instead of their signature high heels in order to perform the choreography correctly. Girls' Generation's visuals for their 2015 singles "Catch Me If You Can" and "You Think" were noted for intricate choreography moves with a more "powerful" and "sexy" image.