What to wear to an Orthodox Jewish wedding?
1) You will want to have a rounded neckline, which covers the chest area. 2) Depending on the community, either 3/4 sleeves or full length sleeves are fine- generally, Modern Orthodox you can wear three quarter sleeves, Chassidic or Chareidi wear full length sleeves. 3) If you are wearing an ankle length dress- wear whatever hose you like, nobody is going to know what you have underneath. 4) As for taking off your cardigan- it generally depends on the type of mechitzah (seperating barrier). If the woman are completely seperate and not visible, it won’t cause too much comment, if the women are visible- best to keep it on. Overall- follow the lead of the other women present if you are uncertain.