Whilst looking at the Marc Jacobs Spring/Summer 2013 show report I saw this outfit and I love it, so I've tried to recreate that, here is my interpretation of it. I couldn't find a similar jacket so I changed the style of that a bit, but I prefer it actually.
DOUBLE-BREASTED COTTON-TWILL BLAZER BEAMS PLUS: £142.50 MR PORTER
MARC JACOBS MEN'S TAPED LOW SHOE: £109 OKI-NI
Bellfield Slim Chinos: £30 ASOS
YMC Oxford Shirt: £50 YOUMUSTCREATE
Total Cost = £331.50