The missing Doctor Who series

There is a great posting from Digital Spy on a missing, unrecorded and in some parts un-written Doctor Who series, take a look here:

The missing Doctor Who series

For some reason one of the episodes that tickles my fancy is where The Doctor visits Blackpool, Sonic Kiss Me Quick hat Doctor?

I loved Colin Baker as Doctor Who, he was simply years ahead of his time and that was why many did not like him, he was not sweet and sickly like they expected but had a hard, rough edge to him, just as the new Doctor's have in the new series.

The only thing I did not like, his coat, not from any design perspective but The Doctor was meant to, after regenerating, go into the Tardis' wardrobe, pick a new outfit that mirrored his new personality and emerge renewed. Well his new outfit had the same coat at the previous doctor but with coloured panels, so it would be highly unlikely this was just waiting to be worn and had to be made specially, i.e. I know this is fiction but the coat was a 'television' upgrade and didn't fit into the pre-existing storyline the audience knew and loved. It was however completely and utterly on the mark for the 80's.

Where did they get the idea for that coat? Volkswagen Harlequin perhaps?