Plain is sometimes the best choice for clothing. Like a plain shirt paired with a necklace or bracelets maybe a cute pair of boots. Colors that look good with accessories are pastel colors and some dark colors, like black and navy blue. Heres a pic of plain but pretty clothes. (the picture above shows a navy blue shirt with plain skinny jeans and low, button, ugg boots).
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p.s boots with some sort of pattern or button works best with the plain but pretty thing.