Is something wron with wearing a green pants and a purple shirt ?

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My mother use to plead with me not to wear floral patterened clothes with plaid ,that is not allowed in the rules of fashion.I could not see what was wrong with it but I went along with it.Similarly she used to tell me try not to wear more than three colours and ensure there are no colour clashes .She would say for example go for a lot of pastel colours ,even to this day I dont know waht those are.In you wardrobe go for blues ,black,whites firstly as these colours can go with anything and then go for the more exciting colours like the red ,green ,purple and and oranges if you must (and the last two are a last resort ).She would say of you wear bright colour like oranges use something dark to "tone it down ".And the list would go and on. Now I am grown and the principles firmly planted in my mind ,I consider myself a good 'dresser' but I am now questioniing the rules of dress on the several grounds.Who came up with these rules and what if the person had thought then that green and purple were trendy then we would now be wearing green and purple, so why cant we be pioneers and do likewise.Secondly if all of us dress the same way ,wouldnt that be monotonous and boring .How would we express our individuality.Thirdly who are we dressing for others or our selves and why should we make someone else happy while we would be happier in an unorthodox style . I say to he** with it and wear what you like