The McBastards Green Trucker

One size fits most adults. The adjustable closure at the back, a plastic snapback or a strap with a buckle depending on the style, lets you set the fit.

Hand wash in lukewarm water with mild detergent, or spot clean with a damp cloth. No bleach, no brushes, no washing machine. And keep it out of the dishwasher, whatever the internet told you.