The 1981 Oakland Athletics won the AL West (technically the first half, as a strike split the season into two half-sesason division winners in each of the four divisions at the time) thanks in part to "Billy ball." That was the style employed by manager/GM Billy Martin.

Saturday, it is Retro Billy Ball day in Oakland Coliseum with the Cubs visiting (Gametracker here).

As part of the fun, the Cubs and A's both wore 1981 throwback unis. There will be some people who hate these, because it's the internet and you can find someone to hate pretty much everything. Personally, though, I love both of these.

The powder blue:

And the yellow pullovers!

Another nice touch is the A's broadcast went with the retro graphics, too:

Beautiful work all around.