Answer:

ARMHOLE

AnswerCrossword Clue
ARMHOLESleeve opening
ARMHOLETop opening?
ARMHOLEWhere a sleeve starts
ARMHOLEPart of a muscle shirt
ARMHOLESleeve feature
ARMHOLEShirt part
ARMHOLEPart of a vest
ARMHOLEPart of a coat.
ARMHOLEVest part.
ARMHOLEGarment feature.
ARMHOLETop opening
ARMHOLETee shirt opening
ARMHOLEVest feature
ARMHOLEVest opening
ARMHOLEYou might put a fist through it
ARMHOLESweater opening
ARMHOLET-shirt opening
ARMHOLETank-top opening
ARMHOLEGarment opening
ARMHOLEOne of two for a tee
ARMHOLESometimes hard-to-find shirt opening
ARMHOLEWhat you might accidentally try to put your head through when getting into a sweater
ARMHOLEOpening on the side of a vest