There are hand-made Tzitzit available, and there are also machine-made ones available, and of course there is a price difference. According to Chabad custom, is it necessary to acquire hand-made ones, or are machine-made ones kosher for use?
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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