Keeping shirt cuff length at 3/4" under the coat sleeve consistant.

I was wondering how to keep my coat sleeve from riding up my arm exposing more of my shirt sleeve or at times covering the shirt sleeve completely on one arm and showing 4 inches on the other arm. There are times when I have my arms full of items and I cannot pull my coat sleeve down to cover my shirt sleeve. A small inconvenience but one that I was curious about how others handle the professional look of showing only a small part of the shirt sleeve.