Why did Avril Lavigne wear bra and underwear only in the beginning of her music video what the hell?

In the music video for "What the Hell," Avril Lavigne's choice to wear only a bra and underwear at the beginning emphasizes a rebellious and carefree attitude that aligns with the song's themes of independence and self-expression. This bold visual choice reflects a departure from traditional pop star imagery, showcasing her desire to embrace a more edgy and youthful persona. Additionally, it sets the tone for the video, capturing attention and highlighting the fun, unapologetic nature of the song.