A passover seder is a religious event and you would normally wear the same type of clothing that would be worn to the synagogue or at a sabbath meal.
Guests who are not familiar with religious customs can wear any nice outfit (maybe with a sport jacket), though tee shirts, jeans, tank tops, tight shorts and outfits with decolletage are not appropriate in religious circles and will result in polite stares until others at the table get used to the fact that you are really a nice person.
Pillows for leaning, wine, and Matza
Seder = סדר
The seder plate. See also:More about the Seder
The Seder Plate is a special plate for holding the symbolic foods used during the seder. Pieces of the symbolic foods are distributed to everyone during the course of the seder. Traditionally, the person leading the seder is the only one with a Seder Plate. However if there are many guests, additional Seder Plates can also be set on the table.
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during a passover seder.
A seder plate is placed on a dining table.
Sam Seder was born on November 28, 1966.
Sam Seder was born on November 28, 1966.
Stjepan A. Seder has written: 'Plitki grobovi'
Tim Seder was born on 1974-09-17.
the seder plate has six iteams on,
The word 'seder' means 'order'. In the case of the Pesach seder, this is a religious service with a specific order of steps or stages.