I can't remember why, but having a Halloween party coming up I decided to dress as a monstrous-Crow / Raven (big black bird)
The best thing about a self-made costume is you can be fairly certain no one else is going to look the same...
It's made from / with:
Needles and thread
A pair of gasses
(and a few other things)
Step 1: The "hat"
The head starts with a close-fitting "hat", it doesn't move and keeps everything firmly attached to a head.
I wrapped myself in cling-film then applied paper and PVA glue, waited for it to dry. The paper and glue were then built up in stages.
PVA and paper is quite flexible, this did not turn out hard.