A class B uniform is a short sleeved uniform blouse. A short sleeved uniform blouse for the LAPD does not have a tie included.
from Christopher Dorner – Manifesto on Rap Genius
Meaning
Hernandez’s report claimed that Dorner was asked to “fix his tie,” adjusting his uniform to proper standards. However, Dorner and photographic evidence suggest that Dorner was never even wearing a tie.
Dorner claims to have worn a “Class B” LAPD uniform, issued without a tie standard and generally never worn with a tie. This inconsistency matches others claimed to be found in Hernandez’s report by Dorner.

LA County Class B Uniform Blouse
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