A basic crew-neck long sleeve T-shirt produced by comparing and researching “sewing” and “pattern” parts of American undershirts from 1910 to the 1970s. The fabric is a heavyweight waffle fabric made of American cotton. The waffle fabric has a characteristic of an uneven knitted texture, excellent warmth retention, breathability, and elasticity, and was used as an undershirt by the U.S. military. At T.T, two twin-filament processed yarns are drawn together to give it volume so that it can be worn as a single piece. The cuffs are made of the same two-tiered circular knitted ribbing as used on undershirts from the 1910s.