That's a pretty common "enhancement" penalty in lots of states. In California there can be an add-on penalty for wearing a "body vest" in the commission of a felony, but the law doesn't go into effect until next year.
http://www.leginfo.ca.gov/cgi-bin/displaycode?section=pen&group=12001-13000&file=12001-12022.95
12022.2. (b) Any person who wears a body vest in the commission or
attempted commission of a violent offense, as defined in Section
29905, shall, upon conviction of that felony or attempted felony, in
addition and consecutive to the punishment prescribed for the felony
or attempted felony of which he or she has been convicted, be
punished by an additional term of one, two, or five years. The court
shall order the middle term unless there are circumstances in
aggravation or mitigation. The court shall state the reasons for its
enhancement choice on the record at the time of the sentence.
(c) As used in this section, "body vest" means any
bullet-resistant material intended to provide ballistic and trauma
protection for the wearer.
(d) This section shall become operative on January 1, 2017.