Formal dress in Japan can be a kimono.
It's the same I think
a formal dress that goes to your ankles.
It's a traditional dress/mat wrapped around the waist that Tongans wear to all formal occasions.
A dress should be below the knee to be considered formal. Also, the dress should be a solid color such as navy blue, black, tan or brown.
A smart formal dress code means neat, formal dress. For women it means a long gown. For men it means a black suit with a black bow tie.
Semi Formal to Formal Outfits
A teen will need a formal dress for prom. Prom is a very formal affair for high school students that allows them the chance to dress up more formally than usual.
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The dress code for the banquet is formal attire.
formal
That would be a formal occasion, so formal dress, which means a very nice dress or suit.