White tag says "RUSSEL | SOUTHERN | COMPANY | L 42-44", with "WPL 7232 | 100% COTTON | EXCLUSIVE OF | ORNAMENTATION | MADE IN U.S.A." on back.
From a vintage clothing dealer in Spring Hill, FL.
Later shirts were 3-color. The early shirts were screen-printed by a club member. Current club members I asked didn't know who had the screen last.