Wearing Over/Under: It would seem from halachah (perhaps it’s al pi kabbolah) that beged needs to be the second from top. When jacket or vest is worn tzitzis beged would be OVER one’s shirt. When jacket or. vest is not worn, tzitzis beged would be under shirt. There is a famous picture, however, of Rav Moshe ztzvk”l without a jacket and with his tzitzis over his shirt. On Shabbos, where there is no eiruv, there could be a problem wearing under one’s shirt where it becomes necessary to fold the beged to make it fit smoothly. Ask your LOR for guidance.
More on Size: According to the Chazon Ish the amah is measured from the shoulders IF the width of each shoulder is wider than the hole. According to the Mishnah Berurah, however, the length of the beged is from bottom of opening (from each side). Width is across according to everybody.
Many commercially bought begadim often do not measure up according to the size noted on the tag. . . Certainly not according to method described by the Mishnah Berurah and even according to the Chazon Ish since often the shoulders are not wide enough.
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