Chris Creamer on Twitter: "For 2019 MLB All-Star Workout Day, caps will be silver with AL players wearing red accents, and NL in blue. Caps feature crossed bats with the team logo
Here's a sneak peek at all the special uniforms MLB teams will wear for holidays this season | MLB.com
MLB holiday jerseys 2019: Sleeveless for All-Star, retro for Fourth of July
M.L.B. Goes Black and White in Search of Green - The New York Times
MLB Uniforms 2019: Here's all the new jerseys, T-shirts, and caps - SBNation.com