I like that Elliot's wardrobe isn't afraid to state the obvious. He has several outfits that explain what he is exactly.
I guess at least "baby boy" addresses the question of his gender. This one is less helpful.
I tried to find shirts like this for myself, but there weren't any that said, "Paunchy 35-year-old male with no sense of direction."
I also admire Elliot's ability to rock the bib-with-no-shirt look. I tried this myself at the office once, with disastrous consequences!