For tuxedo shirts the top half of the center is made of pleated (usually pique?) fabric. Is the rest of the body of the shirt usually made of pique or poplin/broadcloth? Must studs be used with tuxedo shirts? Is it acceptable to use white or dyed black MOP buttons to close the shirt, and if so, can it be a standard french front or placket front, or must it be a fly front covering the buttons?