Not an halachic question, but we can read many things about talis katan: wool over cotton, tzitzis out or in, etc. It seems that the Lithuanian minhag was to tuck them in, but what about the material? ...
When buying Tzitzis, I have seen that there are two types of garment: A "round" neck (the hole has a racetrack shape). A "V" neck (the hole for the neck has a diamond shape). What is the reason ...