According to Details, this trend originated with SoCal surfers who layered looser tees over form-fitting thermal or neoprene gear when they weren't riding the waves. Still, it's a look most grown men won't be taken seriously in. For parents who constantly worry about whether or not their kid will be cold, it's been appropriated as a way to sneak in an extra layer while letting your child run around in that Sesame Street graphic tee he refuses to take off.