Very simple--umpires wear blue uniforms.
sometimes they wear black wind breaker shirts or black suit coats, but the blue is tradtionally the colour and they are even called 'blue' by managers and players
how black umpires are there the 2013 season
According to the official MLB rules, section 9, umpires are required to wear a uniform, but it does not describe what the uniform is. It is safe to assume that they all have to appear in the same clothing (hence uniform), and it cannot be deceptively similar to one of the teams' uniforms.
cuz they like to look weird
Detroit Tigers, Toronto Blue Jays and Chicago white Sox
uniforms are gray and blue,red and blue
*That should be announced after the 2010 regular season ends in October.
All of the MLB players currently wear Majestic uniforms.
Umpires do not decide or announce changes in the strike zone, that is determined by the MLB Rules Committee. The last such change by the committee was in 1996, when the lower limit of the strike zone was changed from the top of the knees to the bottom of the knees. Umpires simply call the strike zone on what THEY PERCEIVE as the size of the zone in the rules in effect at the time.
Home uniforms were white with blue lettering and trim, road uniforms were gray with blue lettering and trim.
San Diego retro