Do not include any text elements, no text, dont use text, no text, that are cartoonish, comical, or lighthearted in the vintage classic metal t-shirt design. Avoid any cheerful or bright colors. The design should not contain any references to pop culture or contemporary themes. Do not include any text or logos related to specific brands or products. Ensure that the design is not overly simplistic or minimalistic, and avoid any elements that might make it appear like a children's or casual clothing design. Please stay away from any imagery that could be interpreted as cute, friendly, or humorous.