Picture a citizen of the Roman Empire. What are they wearing? Most likely, you imagined someone wearing a white toga, sandals, and maybe some kind of laurel on their head. But most ancient Romans didn't really dress that way in their day-to-day lives.
Many of us get our ideas of how Romans dressed from pop culture - movies like Spartacus or Gladiator, or TV shows like Rome. But no movie or TV show can perfectly recreate a historical era no matter how big their budget, and many don't try very hard.