Are you aware that the dye of your denim plays an important role in the 'look' of your outfit? If so, good for you. If not, study these examples! Dark jeans will (typically, though it does depend somewhat on the cut/style of the jeans) dress up an outfit. Light denim (typically...) will dress down the look of the outfit. These outfits are the same, except the jeans! One would easily be suited to dinner, the other more for lunch.
(Since I was headed out to lunch, I did in fact wear the light bell bottom jeans.)
Blazer: $4 Goodwill
Top: $8 Urban Og
Jeans: $20 (sale) Alloy (similar here)
Shoes: $8 Urban Og