The throwbacks are part of the NFL's AFL Legacy program, which is marking the 50th anniversary of the AFL's founding and will feature the eight original AFL teams wearing throwback uniforms when they play against each other.
For the Patriots, that means red jerseys for their home throwback games, like Monday night against Buffalo (which will be decked out like so), and white jerseys when they face an original AFL franchise on the road, like their Week 2 matchup against the Jets. The one constant will be Pat Patriot, who's also being featured on the Gillette Stadium program covers this season. (For more on the AFL Legacy throwbacks, and all of this season's NFL uniform changes, look here.)
Everyone loves Pat, of course, but some hard-core AFL purists have been grumbling that the Patriots' throwback uniform should have featured their old helmet with the tri-cornered hat, which was worn during the team's inaugural season in 1960. There's a good story behind that design, too. Then again, Pat has a pretty good story of his own.
Incidentally, the coaching staffs are being outfitted with throwback attire as well. But some coaches always look pretty much the same, no matter what era their gear is based on.