At the premiere of "If I Stay" in 2014. Known for her youthful and playful fashion choices, Moretz embraced a more sophisticated look for this high-profile event, signaling her transition into a more refined and elegant fashion persona. The gown she selected was a departure from her previous red carpet appearances, showcasing her evolving taste and maturity as an actress.

The gown featured a sleek, modern design with intricate detailing that accentuated Moretz's graceful presence. Its classic silhouette, combined with contemporary elements, highlighted her ability to blend traditional elegance with modern flair. The choice of the gown not only suited the tone of the film but also underscored Moretz’s growing confidence and her emergence as a style icon in her own right.

This fashion choice was well-received by critics and fans alike, further establishing Moretz as a figure to watch on the red carpet. Her decision to wear such a gown was indicative of her strategic approach to fashion, understanding how to balance youthful charm with mature sophistication. The look was a testament to her evolving personal style and her ability to make bold fashion statements.

In summary, Chloë Grace Moretz's choice of a mature gown for the "If I Stay" premiere was a notable moment in her fashion journey. It represented her shift towards a more sophisticated style while maintaining her individual flair. This appearance not only highlighted her growth as an actress but also reinforced her status as a rising fashion icon in Hollywood.