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Sims 3 Question, about objects? - sims admitted into sorority

Ok. That's what I do not understand. In The Sims 3, you can customize clothing. For example, if you go to a dress createasim SIM card can change the color of each garment. I do not understand when you play the game and go to purchase. Click on a subject ... Before you buy, you can "shuffle" color theme, but in reality, nobody can give and take the desired color. I must admit that after a while you get a random color you want, but it is definitely in order to access the item before you buy it and change the colors of your purchase to .. Kind of chance, but to be able to choose their seats?