The writer offers this further explanation,Rule 10 is for example absolutely ridiculous.
"choose the clothes you are drawn to naturally. You will wear them better and more often than those you talk yourself into because they seem practical or look well on someone else."
That has been my experience. I find authenticity essential to dressing well. It's almost always a mistake to try and dress like someone else, because we wind up looking not like that person, but instead like someone attempting to dress like someone else.