The Alter Rebbe writes that a person who has fulfilled his obligation of making Kiddush may not make Kiddush for some-one who can make it for himself, also at the day meal of Shabbat. If this is so, then is he allowed to make Kiddush for his wife if he has already heard it in shul?
There are no hard and fast rules about white shirts. In general, a white shirt is considered to be a modest but respectable garment, and a person should wear clothing that is respectable.
Also, part of the day is spent standing in prayer in front of the Creator, and this certainly warrants respectable attire.
In any case, the main thing is not the external garments, but rather the spiritual ones, namely, a person’s thought, speech, and deed. Physical clothing is only a means to the end, the goal being purity of spiritual garments.
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