I really don't think it matters. I played football last weekend with my workmates and even though we had mixed kits no one had any trouble picking their team mates out.
And because I can't resist a dig and Premier League teams.......Man United and Chelsea both bring out about 6 kits a year and they seem to pick each other out ok!
And what about that match that Man U played against Southampton, when they wore grey tops, and Ferguson complained that the players couldn't see each other against the crowd, then they went on to lose 6-2 :D