Her boyfriend's shirt?
I get it. She's trying to do the whole 'I just fell out of bed and borrowed my boyfriend's shirt look'. Okay, fine. But basically it just looks like she's got on a massive shirt, some tiny shorts and some high heels - on Sunday afternoon. So really, it turns out looking more like a very late version of the walk of shame.
A. Take off those heels. Heels with shorts rarely work, especially during the day. Where is she going anyway, it's Sunday afternoon for goodness sake. Put on some flats.
B. Put your own clothes on. It's acceptable while at home, but if your going to leave the house take off his shirt and put your own on.
C. Keep the shirt but put on some skinny jeans. That might look cute, and a little less faux-street walker crossed with a lecturer.