According to an interview with Steven Moffat the costume we currently see on the 11th Doctor was completely different than what was originally planned. Apparently Matt Smoth was uncomfortable wearing the original outfit and the new costume was arrived at last minute based on Matt's recomendation.
The original costume for the 11th Doctor was ".. a bit more piratey, big long coats and all that stuff- and Matt hated it all".
Supposedly there are several pictures of Matt wearing the original outfit.
I would love to see what the original outift looked like.
Matt grew fond of the bowtie after watching the 2cnd Doctor in "Tomb of the Cybermen" and recommended the tweed jacket with the elbow patches.