I will choose stores for my children to shop at, but in order to allow them to excercise some free will, they will pick out their own clothes. So my daughter may choose the khaki skirt from JCrew kids or the cotton polo dress from Ralph Lauren. The sons can choose from Crew kids, Ralph Lauren, Tommy Bahama, etc.
Lord, I still can't bring myself to wear spaghetti straps or skirts above the knee. I admit that I am rather conservative and have terribly preppy tendencies.