oneofapair I am so sorry for you loss, you must be devastated.
I lost a very close childhood friend last year and can in some way understand the anger and sadness you are feeling.
Our friends had a very long debate following the funeral as a number of us felt that her wishes were not carried out (she was terminal ill for a while and had expressed her wishes clearly)
we concluded that the funeral was more for the living than the dead and each of those individuals at the funeral needed to deal with it in a different way.
colour was an issue with her too and not everyone felt able to wear colour especially those of an elder generation as it is viewed as disrespectful.
io know it is hard but try and understand that those people were all struggle to come to terms with the loss of your sister, they may have been nervous to make a mistake by wearing something inappropriate or may not have been aware of her wishes.
At the end of the day you must focus on the things that were done well, the fact all of those people cared about your sister that they came to say their good byes, the kind words said to you (though people rarely know what to say)
what matters is not the funeral but that people had time to say goodbye to your sister in the way they could best manage.
thinking of you at this difficult time.