I was standing behind a woman in line at a restaurant last week in Boulder. She was larger, but had on a very flattering polka-dot wrap dress. Her hair was long and laid in messy curls. Her make up was simple and clean. She was standing tall, with good posture, and confidently reading the menu.
Then I saw her shoes.
They are black heels, but that white stuff? Scuffed up disgustingness.
All of a sudden she became a larger woman in a poorly made wrap dress, the patterns didn't even match up at the seams. She was standing in a very masculine stance. Her hair was badly in need of a wash, a brush, and a style. She didn't take the time to balance her eyeliner and shadow with a complementary lipstick or gloss. She had pale blue purse that was dirty and worn. She didn't take care of her belongings. And was oblivious to those around her.
Now you want to tell me the details don't matter? They can completely change someone's perception of you. Noticing one bad thing just leads people to notice others, and not just about what you are wearing. They'll start in on sizing you up as a person.
Just avoid the opportunity for people to notice one of those kind of details. Get a shoe polish kit and use it. And when your shoes get that bad... throw them out. Use this advice for all of the "details"...