@CongNong My take is red is bright and cheerful, black is somber/gloomy, white is calm and harmonious fellow, while green is a total freak, you better not associate with. Though it all depends on what character traits author connects with colors.
@TheDollCollector Well blue has to be cool, literally cool, so clothes were designed not keep any warmth.
@Hollow7F I wouldn't trust a man with pants on his head, who knows what he is hiding behind those wide pant-legs of his. Maybe there are horns, or even worse - tentacles(not meant as an insult to twi'leks).