Shirt is ugly, cardigan is ugly, tie is wide for jeans. Tie doesn't belong with the massive cuffs, shirt doesn't go with the tie, cardigan doesn't go with anything. Jeans and boots are fine together. Teger is right, as well - that flat cap ought to be reserved for Man of Kent.
Unfortunately, these are indisputable medical facts, much in the same way that it is universally accepted that AC/DC's "For Those About to Rock" is one of the greatest songs of all time. If you traded out the shirt for an oxford and the cardigan for a tweed or rumpled wool coat, you'd probably look a lot better, more like a Japanophile (Asianphile? Asiatophile? Pedophile?) professor, and less like someone who is probably colorblind. Think about these things, and ask yourself if those who are about to rock would salute you. The answer, in this case, is no.
Ya see, that's what I am talking about. Class, good advice, cheeky without being cruel, and coming from someone whose fits are usually both interesting and do your body shape justice.