Every few years, every major league baseball team gets a new batting practice cap design. ESPN’s Uni Watch has published a sneak peak at all of the new team caps, including the new Nationals cap, shown here.
The white cap with contrasting brim replaces the previous red cap which was distinguished only by its blue piping.
LET TEDDY WIN 
Not bad, I see they took a page from the Orioles with the white front panel
Nats brass should incorporate this hat into the regular season uniform. It’s distinctive. Right now, Nats look like the Reds at home and the Braves on the road.