I've got a similar blazer to that from Topman.
Dark-wash dark-blue fitted jeans. Or alternatively if you have them, navy/grey trousers. Wear a plain white fitted t-shirt, £5 from Topman, with hi-tops or smart shoes (brogues etc). It looks great.
Any other suggestions/ideas are welcome ... I need some kind of outfit for my 21st which is coming up in less than 2 weeks
REP for most helpful, thanks guys x
Am I the only person who is seeing a green Diesel t-shirt linked 3 times from republic?
IMHO, that blazer is a statement piece and would not look right with that kind of t-shirt..no motifs, writing or bright colours..keep it simple. Dark coloured (navy, black, dark grey) slim fit jeans and a plain t-shirt.