Some nerdy Halloween costume ideas females include dressing up like Internet memes, Star Wars characters, Doctor Who characters, Harry Potter characters, female versions of Marvel's Avengers heroes, and Star Trek characters. Costumes can be store bought or home-made.
A popular Internet meme that makes an effective and affordable costume is hipster Disney princesses, which can be worn solo or with a group. Another nerdy group costume is a group of female versions of Marvel's Avengers, including Captain America and Thor. Create less mainstream costumes, such as Doctor Who characters, at home using regular clothing items bought at a thrift store or shopping mall.