Wearing head to toe designer duds attitude. Style is not about the labels you wear but more how you put items together and having your own ideas on styling. Mixing high and low labels is a good palette to work with.
Over accessorizing - unless you're a fashion editor, stylist etc at fashion week , in the normal day to day lives of most of us overloading on accessories can look a little tacky, so go with less is more.
If you can't walk in the shoe then don't wear it. The countless times Ive seen a women wearing either sky high heels or just plain uncomfortable shoes is just painful. So in order not to embarrass yourself wear shoes that fit and you can walk in.