Wind & Denim
Sometimes you have to take your boyfriend's shirt and wear it as your own... I just love thick indigo, men's fitted button ups.
Although white denim can be tricky (for me), because getting dirty seems to become fairly easy with them on, I like styling white denim with an oversized button up (whether it's also a white button up, striped, or denim) and sneakers to dress it down.
Denim Button Up - A.P.C. | White Denim - Levi's (similar here) | Shoes - Adidas Samoa