These are the Astros' holiday & special events hats, uniforms
MLB unveils holiday caps, uniforms - NBC Sports
MLB 4th of July uniforms: What teams are wearing on Independence Day
Logos and uniforms of the New York Mets - Wikipedia
Poppies on Uniforms Today as Major League Baseball Observes Memorial Day – SportsLogos.Net News
MLB Holiday Caps 2020: Will They Be Worn? Available to Buy? – SportsLogos.Net News
MLB, Orioles Unveil Special Event Uniforms For 2017 Season - CBS Baltimore
MLB unveils colorful new uniforms for All-Star game, Fourth of July, other holidays
Jackie Robinson Day, when MLB players can wear No. 42