Is it odd to wear these clothes on a very formal event?

The guy wearing tux all classy and elegant and the event took place in a very exclusive social club and restaurant and is a members only club. The guy has a date and brought her with him, but the date did not wear formal clothes or a formal dress, no she wore pants with a normal white blouse and a huge black coat covering her. The pants are more pants to go to the office , not or a shiny pants or a formal pair of pants and the blouse looks a bit informal too. Is tht ok to be dressed like that to a fancy place while your SO wears formal but your partner did not?

Is it odd to wear these clothes on a very formal event?
Post Opinion