C.C./C2 from Code Geass

A woman dressed in a cosplay costume, likely from the anime series Code Geass. The woman has long green hair styled in pigtails and is wearing a white dress with red accents and a black corset. She is also wearing knee-high socks and shoes. The background of the image appears to be a convention center or similar venue, with other people visible in the distance. The overall atmosphere suggests that the woman is attending an anime or manga convention, where she is showcasing her cosplay skills.