Heya, this one is very unclear (sorry about that).
Get Sam to model for you in her white undies. Then click the bra and she'll go topless. Then change her pose to have her hands cover her breasts. Then take a picture.
Heya, thank you for answering (better late than never 😏) but someone else already answered below revealing that we can take bra off by clicking on it since it is very unclear as you rightly stated yourself since there is no hint that the bra is clickable and I figured out myself that it had to be Sam because it doesn't work with the other girls for some reason. 😅