mourning dress

[Cygnus]

I imagine it's the same as "normal" dress code for such situations. Dark and subdued colours are preferred.

A dark Argyll jacket with a black tie, simple semi-dress sporran, with matching (but dark) kilt hose would probably do the trick quite nicely.

I probably wouldn't wear a kilt to a funeral (in the States) unless the deceased's family requested it, though. It is, after all, not a service to honour you and I wouldn't want people to feel I was trying to steal the attention in such sombre circumstances.