The female umpires I have worked with, observing their equipment inbetween games whiskers
....well now that I think about it I actually got "forced" to wear one of their CP's but that is LONG story....one that she will NEVER do again.
But back to the OP, I have seen The Ump, and Shutt Kool Vest's and one worn a Honigs K2, and a few I have seen wear basic catchers chest protectors. The Ump is the most popular of the female umpires I have seen.