Cliché #96: the FMC borrows her love interest's shirt and it's always perfectly big on her

I turn to look at Ben sheepishly. "Hey, um, can I actually borrow a shirt?" I ask him. He nods and throws me one of his old shirts.

I go to the bathroom to change. I pull the shirt on and look at myself in the mirror. It's big on me and falls mid-thigh.

Ok but how does the situation of borrowing a guy's shirt happen so frequently in wattpad books like never have i ever in all my existence needed to borrow a guy's shirt nor do I think a guy would just give me his shirt unless I'm his gf or something