One One Six - S6-E2
Continuity mistake: When the Sons are meeting with the Irish, Jax rides up on his motorcycle late to the meeting. He removes his helmet and his hat is backwards, revealing the Sons logo. In the next shot, when he's shaking the Irishman's hand, it's forward, then in the following cut back, it is backwards again.
Chosen answer: The First 9 wore these, as can be seen on old pictures. They later switched to leather, but Piney just never did.
Friso94