
I have a mainly black dog and also from colours already mentioned you could look at red, pink, dark green, light grey, orange, white, you name it anything but a dark colour. I would stay away from black, dark grey etc, even to a certain extent dark brown..
I got myself a lovely trouser suit from Next last year, not that its been lucky as everytime i've worn it i've been chucked..

... So for Crufts this year i'll be wearing something else.
I know that some people in my breed wear black trousers and a different coloured top and also very smart dark blue jeans with a bright coloured jacket, this has never gone against them in the ring - yes they do generally have lovely dogs too.