I usually change into crappy, loose, comfortable old clothes when i cook. I seem to be a magnet for grease and staining stuff, so i just wear stuff that doean't matter.
Nothing is so annoying in the kitchen as long sleeves that hang into the water of whatever you're washing, and you get a wet sleeve. I have some big aprons, my favorite is the japanese style, mine comes from a store called Muji and is black denim. I ALWAYS wipe my hands on whatever is handy, usually clothing, so an apron is a good idea. Has to be big and go almost to the back.