It doesn't fit

Looking nervous James slowly nods at her, unbuttoning his shirt trying desperately not to look at Amy's bare chest.

Finally he pulls the shirt from his shoulders, feeling nervous that he's now stood topless in front of a beautiful woman, and hands her his shirt.

Amy snatches the shirt from him, quickly pulling it on, but you won't allow it. As the fabric hits her body you shrink it just enough that it won't fit. Amy struggles with the material a little longer before it rips, now useless to both of them.

The realisation suddenly begins to settle on them that they are currently both trapped topless in the middle of the mall.