Which of the following is not a description of sleeve length?

Sleeve length refers to the various styles that describe how far the sleeves of a garment extend on the arm. The options provided include common terminologies used in clothing to categorize sleeve lengths: short sleeve, long sleeve, and ¾ sleeve. These terms clearly indicate the coverage provided by the sleeves, ranging from no sleeve (in the case of a muscle shirt) to sleeves that extend to the elbow or further.

The term "muscle shirt" typically describes a sleeveless shirt that is often designed for athletic wear or as casual wear. Since this term does not describe a specific type of sleeve length but rather indicates the absence of sleeves altogether, it is not aligned with the context of sleeve descriptions. This is why it is considered the answer that does not fit within the descriptions of sleeve length compared to the other options, which all specify distinct sleeve lengths.