Check the listing for details. CIVIL WAR US UNION CSA CONFEDERATE FOUR BUTTON PLAID SHIRT-3XLARGE. Condition: New. Listed at 43.96 USD. This style of shirt features a roll over collar, a gusseted underarm, button cuff, and curved shirt-tail hem. The back is yoked. The four button shirt is popular for its comfort and style. Made of black check cotton.