I see a lot of the cowboys around here wearing them outside of there jeans.  But, around here there is a lot of mesquite, and I've been told that's why they wear them like that.  It's very apparent the cowboys who are real cowboys with their boot outside the jeans, and the wannabe's who try to copy the look.  The real cowboys boots look like they have been riding through mesquite!  I must say, when I just came down here to New Mexico, seeing all the cowboys from ranches like the Spade, T4 and the Bell..... Whoo..... eye candy right there!