JONATHAN VILLAMAR is not a clothing designer; he just plays one in a videogame. For hours every day, the grocery-store clerk in West New York, N.J., escapes into Nintendo’s “Animal Crossing: New Horizons,” the runaway videogame smash of this coronavirus moment. Mr. Villamar, 22, doesn’t engage with the charming game’s goal-oriented tasks. Instead, he burrows into its character-design portal, a small side-feature where he creates digital versions of real-world clothes like Supreme parkas for his mini-me to wear. With a lockdown order keeping him at home, “Animal Crossing” is the only place Mr. Villamar dresses to impress….