The button on top of a baseball cap
A fabric-covered button sits on the crown of a cap. It does not button anything.
Category: Clothing
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Feature. It covers the spot where the panels meet.
Fitted caps are sewn from six triangular-ish panels that all come together at the top. A covered button, sometimes called a squatchee, hides that join. Metal grommets or eyelets near it add ventilation.
Source: Baseball cap, Wikipedia.