That said, there are a few things that well-dressed women in business casual offices have in common to look great for work everyday:
THEY WEAR A “THIRD ITEM.”
Your third item could be a blazer, cardigan, or statement necklace or other accessory that features prominently, like a scarf, a belt on top of a cardigan or blazer, etc.
THEY WEAR CLOTHES THAT FIT PROPERLY.
Nothing should be too big (watch for hems that drag on the floor ) or too small (watch for shirts that gape across the front, pants or skirts that fit so tightly across your hips that they "smile", and so forth. This may necessitate a visit to a tailor and/or figuring out the best brands for your body type. If you sometimes wear heels and sometimes wear flats, you may want to have your pants hemmed for different lengths — or find a pair of clunky and comfortable commuting shoes that are comfortable enough to wear on your commute, but maintain the same heel height (and hem) as sleeker heels.