2-Person Horse Costume

I was wondering where I could find a pattern, or at least some general instructions on how to make on of these costumes. Most of the costumes are pretty expensive pre-made, and don’t really look that great to warrant my purchase. Any help is appreciated.

It may assist in your search if you use the term ‘pantomime horse’ (you may already realise this, in which case I’ll just trot quietly away, pausing once in a while to look back over my shoulder)