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Name of the popular irish hobby: Step dancing
Posture: The dancers stand very straight with their arms along their bodies.
Costumes:

Men and boys: They wear black trousers and black or white shirts, with or without a jacket.

Womenn and girls: They wear white socks and bright-colored Gaelic dress

Meaning of "Feis" and origin: "Feis" is a step dancing competition, originally created by travelling dance masters who developped their own "steps" and competed against each other to teach in different regions.

Et voilà :)