For menswear traditionalists pursuing the modern dandy vibe, these are the details that really cinch it – the tartan tie contrasting the mini-check shirt against the neutral sweater under the cord blazer with, bon appétit, a paisley pocket square for the K.O.
Another great detail I just thought of that you could try? Line your jacket with a crazy/fancy fabric. I did this with just the sleeves of a Zara blazer last year; here are the steps: find a fabric you like (I used a ladies’ American Indian-esque print teesh, also from Zara), then take it to your tailor and say, “Please do this for me, thank you.” Voila! Or if you're feeling non-traditional and you want a special hidden detail all to yourself, you could...paint your toenails! (Make little faces on the big toes; really indulge, like you’ve taken yourself to a spa for fifth graders) (Oh man, that could be a weird thing, no? Don’t take yourself to spas for fifth graders, what are you doing there!? Get out!)
We'll stick to the traditional details for now.
Shirt – American Apparel
Tie – Uniqlo
Sweater – Ralph Lauren
Sportcoat – A.P.C.
Pocket Square – Vintage