The 90s was the decade that probably was the most influential on my own personal style, given that was the decade of my teen years. I love that the 90s seem to be sneaking back in - slip dresses, combat boots, monochrome dressing. I've done a tiny nod to the 90s here with a tank over a button up shirt.
Style tip: It can get bulky looking if you try to do this with a thick weight button-up. Make sure the one you pick is thin.
Shirt and hat: Forever 21
Coat: Banana Republic
Boots: Town Shoes