dinner dress
dinner gown
formal ,
evening gown

I remember the one dinner dress she had.

And I seem to be wearing a rumpled dinner dress, with all this paint on my face!

He found Con there, still in her dinner dress.

They stopped at the hotel where Margo went to her room to put on a dinner dress.

I could perhaps cut around the stained parts and make myself a new dinner dress.

She was in a dinner dress, with a coat thrown over it.

People in dinner dress watched their approach with more amusement than alarm.

The Baron, wearing dinner dress and a black tie, was waiting for them when they appeared on the stairs.

Probably the party would come in plain dinner dresses, just to show how far above such things they were.

Extended to floor length, these velvet styles become dinner dresses.