Definitions

1. adjective

most formal or elegant in dress or style

“She was wearing the dressiest outfit to the red-carpet event.”

2. superlative form of ‘dressed’

having the most attractive or impressive appearance, especially in terms of clothing

“The dressiest store in town is known for its high-end fashion.”

3. comparative form of ‘dress’

more formal or elegant in dress or style than others

“He looked dressiest than his brother at the wedding.”