Or you could just glue it depending on how much the horns weigh
female Wolverine claws Cosplay props plastic non-metallic Super Hero shirts, Gadgets
Raven and Beastboy cosplay
Female Loki Cosplay from Expo
Not everyone has enormous boobs. And not everyone with large breasts is keen to show them while cosplaying. So here& a smart solution via one industrious cosplayer.