Wow! Those are some incredible materials and they'll make beautiful Sgians Dubh.

For daywear, nobody will think twice about the white Sgian Dubh (Sgian Bán?). However, in looking through the nearest book on highland garb I have on hand, the author goes out of his way to specify that sgians for formal dress are black.

There is the chance, though, that the cost and quality of the materials are enough to carry them into the realms of formal wear.

I'm no expert, though, so we'll leave it for the kilted-veterans to weigh in!