User blog comment:HazelQuill7445/Awesome fan art/@comment-24573226-20160620182448/@comment-24573226-20160620213129

Strapless bras can still have no visibility from the back.

Also (and I can't believe I'm sharing this) when I was 15 I went to homecoming wearing stick-on cups that supported the front.

I'm not saying the girls have hidden bras or that they're going braless. I'm just saying that there are multiple ways to discreetly support the breasts under the clothing. Cinder could have stick-on side-cups under her stealth outfit. Or she could be braless. No shame either way.