Depending on the kind of party, your party wear salwar kameez, Indian party wear,bridal party wear salwar kameez or womens party wear, party wear sarees can be either formal or semi-formal.
Casuals look out of place in a party, unless it is all-girls party. Parties may include a wedding party or bridal party, an engagement party, a reception party, a birthday celebration, or a party to celebrate some achievement.