I believe you're referring to a t-shirt size and possibly a design description. The string "3 4 x 1 2 x 1 2 tee" is not standard sizing notation. To help me understand what you're looking for, please clarify:
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What is the intended size? Are "3 4," "1 2," and "1 2" representing inches, centimeters, or some other unit of measurement for width, length, and sleeve length respectively? Standard t-shirt sizing uses numerical labels (e.g., S, M, L, XL) or numerical measurements (e.g., chest size in inches).
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What type of t-shirt is this? Is it a men's, women's, or unisex style? This is important because sizing varies.
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What is the design? The "tee" part suggests it's a plain t-shirt, but further detail would be helpful. If there's a specific graphic or pattern, describing that would aid understanding.
Once you provide this additional information, I can give you a more helpful response. I could offer information on finding a t-shirt with similar specifications, suggest alternative ways to describe the size, or even help you design a custom t-shirt based on your description.