Mountain bike shorts for commute

Mountain bike shorts are ideal for commuting. If they fit, are comfortable and you like the look of them, you won't find a better commute short. If you a fast rider, over 11km the extra drag of baggies will cost you a few seconds over a lycra skin suit.

However, if you are riding a road bike, you are breaking Rule #18 :)

For commutes of that sort of distance, just wear whatever is comfortable, and that you've got enough of to stay fresh. For me, when I started, that was gym shorts and tops. Padding shouldn't be necessary over that distance, but feel free to wear it if you like.