I carry mine either in front trouser pocket, or front breast pocket. I use the lightest, thinnest, smallest wallet possible... just enough to carry a few cards and some folded cash. That's all I need 90% of the time. I have another wallet to carry everything else and just take that too when I need to.
I also have a couple MTM trousers with an extra hidden pocket that opens at the waistband. It's large enough to fit a small card-holder wallet. I really like this... I've been thinking about taking other trousers to tailor see if they can do those too.
I really hate carrying keys and cell phones. Nowhere to really carry those without causing odd bulging and pulling. That's why I often carry a jacket/coat with me even though I might not need one.