arm slit

What's with all those zips, pockets, fancy collars, arm slits and heaven knows what else?

Opening the boy's undersuit fully, he then brought one arm out through its arm slit so that he could press the soft wool against the boy's flesh.

The MA gown has long closed sleeves with arm slits just above the elbow and a crescent-shaped cut at the foot of the sleeve, forming two forward-facing points.

It is less voluminous than the clerical-type gown, and has a flap collar and long closed sleeves with arm slits just above the elbow, except for the Commoners' and Graduate students' gowns, whose closed sleeves have evolved into streamers through which the arm does not pass.