Cos-play or costume play is not dressing up for Halloween.
Cosplay means looking like a character from a comic book, movie, or novel, and taking on the persona of that character. This means copying the exact dress and attitude of the character.
Cosplay is simply “a way to celebrate your fandom.” So it’s not necessarily a sexual thing. Consider the context and surroundings before assuming a costume is an invitation for sexual attention.
Cosplay can be sexual or nonsexual, depending on the context. Dressing as Wonder Woman and doing a strip tease for your nerdy gamer boyfriend? Sexual.
Some of the inspiration from internet :