set-in sleeve

from The Collaborative International Dictionary of English v.0.48

set-in sleeve \set"-in sleeve`\ (s[e^]t"[i^]n sl[=e]v`), n.
   A sleeve joined to the body of a garment by a seam starting
   at the edge of the shoulder and continuing around the
   armhole. Contrasted to a {raglan sleeve}.
   [PJC]