NOBD: reminds me of another aphorism. While "everybody knows" that you are supposed to wear brown shoes with a brown suit, it's actually quite hard to do it well. Aside from black tie, brown+brown is the only suit-shoe combo where both are the same color. So you have the risk of not enough contrast (too matchy) or too much (jarring.) Very hard to get right.
I know what you mean. I keep picking the polo brown Belgraves in stead of my mink or dark brown suedes. And I keep picking this tie and not a navy one, mostly because of the shoes (same shade; let's say mid-brown and mid-blue). In my eyes (can you say that in English?), the contrast is pleasant.
Brown smiths fresco
Brown stripe shirt
Teal with brown and white diamond tie
Vintage hanky with pink, sea blue and gemstone green
That tie is ludicrously ugly, like -paperbagging it after snorting 3 grams and drinking two bottles of Tequila wouldn't be enough to turn me on- ugly. The same colour or at least colours as loud do work for the pocketsquare.