Tolkien describes the colour of the hoods that the Dwarves hang up in Bag End but that made me think f garden gnomes, which is really not an image you want to give the movie audience! The one thing you don't want in a film is something that draws the eye to it and takes away from the creation as a whole.

However, as a nod to one of the only bits of costume description Tolkien provides, the inside of the Dwarves' cape hoods feature the key colours mention by the author.

Apart from the hoods, the Dwarf costumes are 'colour-coded' as follows:

Thorin - midnight blue;
Balin - predominantly red;
Dwalin: khaki green;
Bifur - rust;
Bofur - a dirty yellow-mustard;
Bombur - tones of olive green;
Fili - a slightly mauve-grey;
Kili - - teal blue;
Gloin - blood red;
Oin - brown;
Nori - grey;
Dori - mulberry colours;
Ori - soft lilac-grey.

The fabrics used for the Dwarves are a mix of wool, silk, corduroy and moleskin with a lot of leather and suede decorated with angular detailing to give a Dwarven look - we even mananged to create Dwarf designs on knitted scarves and waistcoats.

Bifur - rust

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... I get it

Well he 'got it' actually... and then it rusted.