Style is to be defined individually and not everything, that looks good on one person, does also look good on another.
I have learned during my time as a “fashion stylist ” and “fashion designer”, that style follows no rules, and still, for some people it is helpful to go with some basic ideas in order to create their own style.
You have to define yourself, then you should dress, and live accordingly.
“Having a good style” is about much more, than wearing a beautiful dress. It is about the attitude with which you present it.