More Evidence of Zippered Baseball Unis

Apparently Warren Spahn and the Boston Braves weren't the only ones who secured their uniform tops with the interlocking metal teeth better known as zippers. Here's the cover of Sports Illustrated last week:

Stan the Man zipped up his shirt. Why wouldn't these teams use buttons? Why did this stop? The mystery grows.

(Great article by Joe Posnanski about Musial, by the way.)