Funnily enough...
From H2G2 page www.bbc.co.uk/dna/h2g2/A6127841 :
"Baker was taken to a costume house and told to come up with a costume, aided by costume designer Jim Acheson. The look was influenced by a poster by French Impressionist Toulouse-Lautrec of a man with a big red scarf and wide brimmed fedora. Instead of a red scarf Baker and Acheson settled on a multicoloured design."
( ,
Fri 17 Sep 2010, 10:34,
archived)
"Baker was taken to a costume house and told to come up with a costume, aided by costume designer Jim Acheson. The look was influenced by a poster by French Impressionist Toulouse-Lautrec of a man with a big red scarf and wide brimmed fedora. Instead of a red scarf Baker and Acheson settled on a multicoloured design."