When a pig is 'in coat' it means that it has not been chewed, nibbled or trimmed, its left in its natural state and if its a show pig will probably be wrapped up.
If the pig is no longer in coat, it means that someone could have chewed the coat or it has been trimmed.
Its very difficult to keep a pig in coat, I tried once a few years back and the sheltie boar decided that he didnt like his wrapper in and nibbled it out.
Emma x