zipper

He got his T-shirt stuck in the zipper of his jacket.

I also competed in track and field at Idaho, and it's all because of putting the shot that I've got my long scar, my zipper, down the back of my neck.

[…] the usual gap between the time the last strike of the day departed and the first night hecklers arrived was closed with "zippers" — night fighters who, using day fighter tactics, proceeded to the target in daylight in time to relieve the last day blanket patrol.