Jim Harbaugh’s wife takes no responsibility for his wardrobe

49ers coach Jim Harbaugh is a rich man.  He’ll get even richer after the season, when the team extends his contract after three straight NFC title-game appearances — and possibly two straight Super Bowl appearances.  And possibly one straight Super Bowl win. But his wardrobe is limited, to say the least.  Black, long-sleeved shirt.  Tan,…