What type of sleeve is characterized by a seam that runs along the shoulder to the underarm?

The sleeve characterized by a seam that runs along the shoulder to the underarm is the set-in sleeve. This type of sleeve is constructed separately from the bodice and then sewn in at the armhole, creating a distinct seam line where the sleeve meets the body of the garment. This design allows for a structured fit and is common in many tailored garments, providing a clean and professional appearance.

In contrast, other sleeve types have different constructions: the dolman sleeve features a wide armhole and does not have a distinct underarm seam, while the raglan sleeve has an angled seam that extends from the neckline to the underarm, providing more freedom of movement. The French cuff typically refers to a style of shirt cuff rather than a sleeve design, as it is folded back and fastened with cufflinks. Thus, the characteristics of the set-in sleeve make it the correct choice for this question.