Party Dress
The Spanish term 'vestido de fiesta' can be translated into English as 'party dress'. It is a type of clothing typically worn by women on special occasions or social gatherings, such as parties. This term can be further broken down into 'vestido' meaning 'dress' and 'fiesta' meaning 'party' in English.
My sister has a beautiful red party dress.
The phrase is talking about someone's sister who owns a beautiful red dress dedicated for parties or special occasions.
For the wedding you will need an appropriate party dress.
This phrase is advice or a suggestion that for a wedding one will need to wear a special dress suitable for such an occasion.
Ana always goes shopping looking for the perfect party dress.
The sentence is about a person named Ana who frequently shops with a specific goal in mind - finding an ideal party dress.