If I am aware already before Shabbat that there is a chance that there will be an emergency requiring me to travel, must I go there already before Shabbat? Is there a difference between a big chance and a small chance?
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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