This incredible Nike 'Tattoo' sneaker series is a fresh and refined take on the custom sneaker trend. Nike “Tattoo” Sneakers ...

The center of his chest bears a compass tattoo, representing the direction and guidance he attributes to his regular church ...

This is definitely not a swag thing. Sure, the sleeve does have some swag along with his left forearm sleeve (which is likely decorative), but that's not the main reason Antetokounmpo is wearing it.