In 1973, new fashion for baseball umpires was strictly a judgment call - The Boston Globe
Softball Umpire Apparel
Central Maine Board of Approved Baseball Umpires - Home
Should MLB umpires really be wearing advertisements?
MLB umpire salary: How much do they make?
MLB to host Umpire Prospect Development Camp
Some 10 umpires reportedly to opt out of shortened MLB season - The Boston Globe
Ewwww: MLB Umps to Start Wearing Ad Patches in July
Chris Creamer on Twitter: "Umpires are wearing FTX patches on their shirts tonight. This is an advertisement and will remain on there for the rest of the season https://t.co/uaPUbMv7Ap" / Twitter
Explaining the FTX Patch worn by MLB Umpires – SportsLogos.Net News
Beyond the Grunt: Umpires Mic Up, and Baseball Changes a Bit
Looking Official: The Umpire Uniform - Little League
Tom Hallion to be plate umpire for July 13 MLB All-Star Game | AP News
Dale, we know you're gay.' How a Major League Baseball umpire came out - Outsports