since u asked... because if you are under the age of mid 50's... everyone knows that a nice pair of dress jeans, black dress shoes and a black jacket is actually a much dressier look and sharper look than a pair of "khakis"..
Khakis on a more formal night are tacky..
Have you ever seen a cowboy at a wedding, funeral, formal event in a nice pair of starched Jeans, boots, white starched shirt and a jacket and a black cowboy hat???
Prob the sharpest dressed people in the room.
I asked because I wanted other input... carry on TAXman