/cgl/ - Cosplay & EGL

Hello seagulls.
I have never made any costumes or props before. I used to wear lolita and the only crafting I did was sew dresses.
For a fantasy event I want to wear these horns and I was wondering what would be te best way to attach them, before i ruin them.
they are very light and hollow on the inside also about 40 cm.
attaching them to the wig won't be an option, because I want to use them with different costumes.

Hopefully on of the cosplayers here knows a nice way to attach them!