It's weird.

Well cause the manager, manages the team
the coach teaches the players fundamentals

Better yet, why don't other coaches or managers from other sports wear uniforms like baseball managers do? Can you imagine Phil Jackson wearing shorts and a jersey?

Connie Mack of the Philadelphia A's did wear a suit in the dugout though. Report It

because there are many skills in baseball that need coaching....

In baseball, there are coaches for each specific aspect of the game (hitting coach, pitching coach, etc.). The manager's job isn't to coach the players, but to manage the game and make important decisions. The coaches coach, and the manager manages.

the manager manages the team. it also sounds more professional.

"In the early years of professional baseball the term "manager" generally was used to refer to what today is a general manager.. "Team Captain" usually referred to the bench manager. An 1876 National League rule barred managers from the players bench. Bench managers were accepted by the 1890s...Brooklyn's Charles Ebbets was not alone in 1898 in refusing to pay what he considered the excess baggage of a bench manager. He took over the club himself for most of the season."

While this doesn't exactly answer the question, it does point to a kind of blurry line that existed between general managers and bench managers in the early days of baseball. If general managers did run their teams on the field (and it appears that some did), it may be the case that the title manager just stuck, even after they'd given up those duties to bench coaches.

I hope this is the information you were looking for. It's been provided by a real live reference librarian in Central Ohio.

This is a good question, and I don't know why this is, and also if you notice, but I really don't need an answer tol do this, but you see the manger wearing thier baseball team's unfirom, where in other sports, you see the head coach in a suit and tie.

In baseball u tend to manage a team more then coach. And if u called him coach what would u call his coaches? coachA coachB ??

because thats the way it is.
like many math problems and theorems, there is no point questioning something.... this is one of those cases. dont question, just believe.