Two things to look at:
NFHS 8-1-1: (When batter becomes a runner)
d. a pitched ball hits his person or clothing, provided he does not strike at the ball; or
1. If he permits the pitched ball to touch him (7-3-4), or if the umpire calls the pitched
ball a strike, the hitting of the batter is disregarded except that the ball is dead. It is a
strike or ball depending on location of the pitch.
also:
5-1-1: (Dead Ball)
ART. 1 . . . Ball becomes dead immediately when:
a. a pitch touches a batter or his clothing (8-1-1d), a runner (8-3-1a);
1. The ball becomes dead even though the batter strikes at it (8-1-1d).
So, the ball is dead. Pitch is a strike. Batter is out. Umpires go to remedial training.