A friend of mine's daughter wore purple and black! Someone correct me if I'm wrong, please, but I thought that white only became the norm during Victoria's reign.
As for the Queen not attending the civil marriage bit of Charles & Camilla - well, she is the head of the Church of England and Camilla was not only a divorcee but also an R.C. (I don't know if she has changed sides, someone will enlighten me) which was verboten.
I've been thinking about a church marriage for Mr J2 and I. His first wife, whom he married in church, has eventually died (aged 87) and I've not had a church wedding (civil service, so doesn't count, religiously). I've worked out that we are both now free to marry in church; now the problem is how to do it without fuss! :)