Is it normal to wear just a sports bra?
Depends.It depends
Yes, plenty of people wear a sports bra as a top, especially for workouts or in hot weather. Whether it feels appropriate depends on the setting, dress code, and your comfort.
It’s pretty common at the gym, while running errands after a workout, or anywhere a crop top would feel fine. Some sports bras are designed to be worn as tops, while others are more like underwear—so the style makes a difference, too.
There isn’t one universal rule. In a gym or casual setting, most people won’t think much of it; at work, school, or a more formal place, there may be a dress code or people may read it differently. If you’re comfortable and the setting allows it, you’re fine.