Collar studs are used to hold detachable collars. The collar is attached to the shirt by a pair of collar studs. The shirt has a tunic collar, a short upright band of fabric with a hole at the back and one on each side at the front. The stiff collar is attached at the back before the shirt is put on, then the shirt is put on, after which the front stud is pushed through the collar to fasten it.
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