I went almost all brown today for my elevated casual attire.
Over shirt - Khakhi, Pepe Jeans
Under shirt - White, Levis V-neck T
Belt - Cognac, Satya Paul
Watch - Titan brown leather strap, gold on steel dial
Trousers - Espresso brown Corduroy, Louis Philippe
Ornament on the other hand - Semi-precious stone Agate bracelet (wifey's recommendation)
Shoes - Tan suede Derbies with a white bottom sole, Woodland
I used the white T to add a little contrast to the overall brown ensemble. Interestingly, I think the khakhi over shirt, although having a color that closely resembles my skin tone, does NOT give that washed out appearance because I deliberately made this piece as the top layer. Leaving the over shirt fully unbuttoned provides a nice silhouette with the white outer sole of the shoes complements the T and the suede body of the shoes mirrors the over shirt. The golden buckle of my belt adds subtle hue to the brown monochrome. I don't know if you can zoom in, but the oversized buttons on the over shirt have a concentric white-grey combination, which adds a nice detail to the overall looks.