Ofcourse: In order for the knee to covered while getting into/out of a car, going up stairs, and while sitting down you would need at least 4″ for most people. Some people may even need more than 4″. So the point is to insure it is covered in all those, and other, positions. (The schools use the 4″ rule of thumb as most people can’t use shorter and still be covered while getting into/out of a car, going up stairs, while sitting down, etc. The Rabbonim advise to wear something that will insure coverage at ALL times.)
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