Confusing work scene, do underwear need to be stretched like this?

Confusing work scene, do underwear need to be stretched like this?
This is a worker doing a stretching check on underwear in a garment factory. Two metal rods act like two hands to stretch the underwear to an incredible width. This is a very important check to ensure that the underwear is strong and durable. Do underwear really need to be stretched this long?
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