For older dancers, the question of whether or not you can wear a bra with a leotard is common. The answer is: it depends on the leotard.
Ideally, you don’t want straps showing alongside your leotard straps. This means some styles, such as cami strap leotards, aren’t preferred. Other leotard styles, including sleeved and tank leotards, come with thicker straps and higher backs so you can wear a bra without it showing. You can buy specific dance bras, which are similar to sports bras. Many come with clear straps, so they aren’t as visible when worn with a leotard.
For the best of both worlds, you can choose a support bra leotard that comes with built-in supportive shelving, for a comfortable, practical option.