<Li> No attachments: Tape or other attachments of non-matching color may not be used on uniforms . Pants may not be attached to the bottom of the shoe in any manner . </Li> <Li> No images of baseballs: No "pattern that imitates or suggests the shape of a baseball" may be used on uniforms . Notably, in apparent violation of this rule, several teams have used cap or jersey logos that have incorporated a baseball in their design, such as the Toronto Blue Jays, Philadelphia Phillies, Florida Marlins, Minnesota Twins, Milwaukee Brewers, New York Mets, Los Angeles Angels of Anaheim, Colorado Rockies, San Francisco Giants, and the New York Yankees . However, in each of these cases, the baseball element of each logo is either obscured by another logo element, or rendered so small as not to be confused with an actual baseball . The purpose of this rule is to prevent one team from deceiving the other . (The National Football League has a similar rule, which states that no pattern that imitates or suggests the shape of a football .) </Li> <Li> No glass buttons or polished metal . </Li> <Li> No commercial advertisements on uniforms . This rule is at variance with many other professional sports . In North America, corporate sponsors' logos are ubiquitous on vehicles and uniforms in motorsports (such as NASCAR, IndyCar, and the NHRA). Outside of motorsports, sponsor logos are increasingly common in leagues such as the Arena Football League, WNBA, and soccer leagues such as MLS and WPS . Corporate logos on uniforms are even more widespread outside North America, most notably in soccer . The commemorative patches worn by the New York Mets during their inaugural season at the Citigroup sponsored Citi Field did not feature the name of the ballpark in adherence to this rule . However, when the New York Yankees and Tampa Bay Devil Rays opened the season in Japan in 2004, an ad for Ricoh was clearly visible on the batters' helmets . When the Oakland Athletics and Boston Red Sox opened the 2008 season in Tokyo, not only did both teams wear batting helmets featuring the Ricoh ad; but also, the Red Sox featured a commercial advertisement for a New England - based business on their jerseys and the A's jerseys featured an advertisement for Pepsi . Exceptions are made for the manufacturers of the pieces of uniform or equipment upon which they are placed (i.e. the hat manufacturer's emblem may be on the hat). </Li>

First mlb team to put names on jerseys