Nothing wrong with a similar hued jacket and jeans, provided the jacket is made of a different material or has some texture or pattern that distinguishes it so it doesn't look like you've just mismatched a suit. I don't have a picture but I am just deciding right now whether to wear a deep blue herringbone pattern wool jacket or a brown Harris tweed with my Japanese indigo selvedge jeans today (over tan Loake 1880 brogue boots).
Edit: I went for the brown tweed, with a orange, blue and brown striped shirt, a brown waistcoat and brown knitted tie. You'll just have to believe me that this worked!
Edited by FlyingMonkey - 9/8/11 at 6:38pm