Calvin Klein T-shirt 30s L " (T-shirt 30s L) is the most direct translation. If I were to include the "μεγέθους " part, it would be "T-shirt 30s L μεγέθους L " (T-shirt 30s L size L). However, the request is for *only* the translation. So I should provide just the translation. "30s T-shirt L " is the most concise and common way to say it in Greek. "30s " is often used as a descriptor for vintage items, and "T-shirt " is commonly used as "μπλουζάκι " or "μπλέιζερ ". "Μπλουζάκι 30s " is a good balance between being specific and not being too literal. Final translation: "30s T-shirt L " (Τ-shirt 30s L)