Underwear color - Page 2
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The suggestion that underwear and should somehow be matched with one's clothes is quite bizarre and groundless.
The only case that might exist is that if one is wearing a thin light-coloured shirt and wears an undershirt/vest then a light coloured one is preferable. However undershirts are dreadful things and should not be worn anyway.
White underwear is probably the worst - the hardest to clean, it shows up everything and it will dull in colour over time. Men's underwear is becoming ever more colourful and I'm not aware of people really matching underwear to the rest of their outfit.
However....if you wear linen or white trousers, then white underwear or underwear with a skin/natural colour, is definitely the way to go ;)