What type of sleeve is not categorized as set-in, raglan, or dolman?

A sleeveless design is characterized by its absence of sleeves altogether, distinguishing it from set-in, raglan, and dolman sleeve styles, which all include some form of sleeve construction. Set-in sleeves are typically attached at the shoulder of a bodice, while raglan sleeves extend to the collar, allowing for a diagonal seam from the underarm to the neckline. Dolman sleeves feature a wide armhole and a tapered wrist, offering a different style and fit.

Choosing a sleeveless design highlights an entirely different approach to garment construction, focusing on the body rather than incorporating sleeve elements. This makes it the correct choice in the context of the question, as it represents a distinct category that does not conform to any of the specified sleeve types.