Any chance of an odour from my feet and I'll encase them. (No I normally don't have smelly feet ) I think this possibility is where the dislike for thongs/flip flops comes from. Generally encased feet have a lesser chance of projecting their smells on the rest of us.
Yeah. As has been noted over and over it's really about behaviour and hygiene, which unfortunately some have associated with dress. If you're clean, wearing something plane-appropriate and not disturbing people, you're all good.