I am not sure if many people anymore wear black at funerals...at my sons funeral, I wore a purple jumper, with a white blouse...because my son loved me in that outfit, that is what I wore to his funeral...
As for his clothing...he knew he was dying soon..so he told me what he wanted to be buried in...his favorite jeans, his favorite shoes, a new shirt he had just bought one of the last times we were out together, and his hat, that he always wore, to cover his 'balding' head, which was balding because of all the chemo...and so I brought those items to the funeral home, and my son was buried in what he wanted to be buried in...he said, he rarely wore a suit in life, and he did not want to wear one in death...so I followed his last wishes...