Many cosplayers like to sew their own costume because it’s not only fun but also very satisfying. Costume sewing is fun but also requires time and proper planning. 1. Start by planning ahead of time. Some of the best Halloween costume ideas include scary masks of famous villains from comics, horror movies, high quality cosplay costumes popular computer games and scary stories. A: Actually, we need about 2 weeks to make the costume, about 7 days to make a wig, boots or some accessories, but for some armor, props and special items, we may need about 1 to 2 months to finish them.