I have (yet another) question, this time related to diced hose.

In my perusal of kilt-related photos, I have seen quite a few people wearing diced hose with garter flashes or ties that match a colour in the hose and have yet to see somebody wearing diced hose with a contrasting coloured garter.

Is there some unwritten rule that one's garters must match one of the colours in diced hose?

Thank you!