The clothing and colours you wear can create a lasting first impression. So on a date colour is especially important. They can act as a subtle form of communication giving off clues about your personality, attitudes and intentions. In fact when you meet someone for the first time they react to colour in a similar way to how they respond to body language.
In general, strong colour combinations convey confidence. Bright colours especially reds give a dynamic, fun, strong-willed impression, whereas softer pastel shades can suggest sensitive and caring; and greens can be great for putting you both at ease.
If you're going on a blind date, black is a good choice, it'll give you an air of sophistication and will help ensure you don't reveal too much of yourself - unless you want too.
But if you really want to make a good impression, there is no point in being something that you're not, if you think this date really has potential, the best advice is to simply wear a colour that suits your personality.