I would never have put these pieces together like this, but that moment I thought it was kind of cute. To look more casual, all you have to do is roll up the sleeves.
I paired it with pencil skirt which I thought will be unworn forever, and now this oversized shirt becomes the reason to wear it. Pair of skinny jeans also would be a good match.Flax oversized shirt, vintage brown shoes, aviator sunglasses.