A baseball cap and method of assembling thereof is provided. The cap includes a crown that is formed from a single sheet or single piece of stretchable fabric, such as using heat pressing techniques. The cap further includes a support layer, such as made from buckram, which is attached to an interior, front portion of the crown, and a visor and a band which are attached to the crown. The crown has a hemispherical shape. In one example, the crown can include a back portion thereof which has been removed to form an open area across which an adjuster is attached. In another example, a front portion of the single-panel crown can be removed and replaced with a front panel made of a different material to form a modified crown.