Any tartan is appropriate, as long as it is an appropriate tartan for you to wear, if you are concerned about those conventions. As mentioned above, even the "loud MacLeod" is entirely appropriate at a funeral if it is your family tartan.

If, you do not affiliate yourself with any clan or are a non-Scottish kilt wearer, then maybe opt for a darker "McFashion" rather than a pink and yellow number.

As always, just my $.02