Can't say as I do get upset unless they are fashion disasters and I ask myself "don't they have a mirror?". Do you get upset when you see someone driving a Ferrari? Ok I get jealous until I realize they really don't do well in snow and I would still have to have my SUV anyway.
Why let it bother you? Do you think they are out there trying to ruin your day? And why do you think you have to hide your hosiery? I kind of doubt they are jealous because you "get to" wear something. Being envious of an outfit is human nature, getting upset over it is a little out in left field