No they wouldn't be very uniform. And that is just fine. If there are 2 umpires they must match. But if there are 3 or more the field umpires must match and the plate umpire can wear whatever he wants. They don't all have to look the same.
That may be true in baseball, but the usual in softball is all umpires are dressed alike.
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Scott
It's a small world, but I wouldn't want to have to paint it.