Just when you think you've covered all the spacesuits in Doctor Who, you recollect another really obvious one that remains unblogged.
This 4 episode story from 1983 features immortals so very bored with existence that they've stolen sailing ships from Earth's history and made them space-ready in order to race between the stars.
I rather like this story. It dares to be different and offers a visual unlike any other episode of Doctor Who at that time. Having since read Moorcock's Dancers at the End of Time I can see it's inspirations and can only imagine how wilder it could have been had it been made in the previous decade and not the terribly serious 80's. Still lots to enjoy should you ever stumble across it.