I've just returned from the funeral of a dear friend. He stated he did not want anyone wearing black, so all the folk wore a variety of styles and colours that he would have loved (I wore my beloved old DM's, jeans and a red tee-shirt). The service was performed by a celebrant and was wonderfully relaxing, with a lot of humour that my friend would have enjoyed. It was a wonderful afternoon - just as he would have wanted. On coming out, the next funeral was gathering outside, with everyone in black - their choice! Our difference.
This is how funerals how evolved over the years, the last one I attended over 20 years ago, everyone wore black and it was conducted by a religious person. It's now more about saying 'goodbye' - and good send off. Isn't it a bit like everyday life now, wear what you feel comfortable in, who's to judge. I don't think anyone would have been thinking you looked out of place.