The women are dressed in pants and work shirts looking as the men because the women are acting as “men” in the sense of being the ones doing the negotiating and resolving the disagreement (flipped how it would have been viewed in post WW2).
The scene takes place at a bar. Happy joyous men and women dancing at the bar. The tone of the scene is very exclamatory and excited and joyous. Women being able to drink with men at the bar symbolizes overcoming the conflict between them.