Warning: Spoiler! (Click to show)
I quite like that cardigan and that shirt/tie combination. I'm less convinced by the waistcoat/trousers/shoes combination. A rougher-textured, pattered, navy waistcoat and perhaps cords or moleskin for the trousers would feel more in tune with the chunky cardigan. On the other hand, if the cardigan is purely outerwear (ie you take it off completely at work), then I can sort of see what you're aiming for.
Lazy Monday... and a new handkerchief.