Ulysses37 -> Why is Bilbo wearing that natty blue top? (7/12/2012 7:28:40 PM)
A clue to Bilbos new top is seen in the background image of the new 'Legolas and Bard the bowman' photo from the 3rd film. There is a figure in the background, possibly from Laketown, wearing a very similar garment! So I assume the folks from Laketown gave Bilbo this new coat.