You can wear anything you’d like to meditate. The most important thing is that you’re comfortable and relaxed.
If you’re wearing a tie or a scarf around your neck, I would recommend to just loosening that a little bit, if you wearing a belt maybe loosen that too, if your pants are a little bit too tight, same thing, loosen those so that you can breathe more freely. If you are wearing high heels, I’d suggest you get those off.
Lastly, you could wear nothing at all, and that’s just fine too. Whatever feels more comfortable to you, it doesn’t really matter