As for the uniforms, the Red Sox's on Saturday will be a blank button-up with no lettering and a slight off-white or ivory color. The cap will also have a blank off-white tint, and the socks will be a three-part white-red-white combo. Boston didn't wear the familiar blue cap with a red "B" until the early 1930s.
Chicago will wear navy blue pinstripes and lettering on a grayish uniform. The Cubs used this uniform for only one season, changing their road uniforms on an almost-yearly basis during the 1910s.
It sounds like both teams will be wearing the version of their uniform from the last time the Cubs visited the Red Sox at Fenway Park, for the 1918 World Series.