She pushes her chest out

Okay, some guys might like that and some guys don’t because it makes them feel uncomfortable. Whether you do or don’t, it is a sign she is in to you. She will wear her push-up bra just to make that area more pronoun and makes sure that her twins can see light and not hide in the shadows. A bonus sign is that if she arches her back to get your attention by clearly pointing her breast in front of you and giving you that seductive look.