The Pittsburgh Pirates wore their new Sunday throwback uniform for the first time last weekend (you can see a detailed breakdown here). The Pirates are calling it a "1979 throwback" -- understandable, because they won the World Series that year -- but this design was actually part of a larger mix-and-match uniform set that was worn from 1977 through 1984, a period that uni aficionados now refer to as the team's "bumblebee era." That era cemented the Pirates' status as MLB's most creative team when it came to uniforms, and we're going to take a closer look at it today.