Banana Republic “The Oversized Shirt” white button down size small (but I would say would work on a slim medium as well) From their website: Cut with ease and crafted from our washed cotton poplin, this oversized shirt has high slits at the sides to show off high-waisted styles. OVERSIZED FIT: Relaxed fit with a dropped shoulder. Point collar. Chest pocket. Button front. Shirttail hem. Excellent condition with no stains or tears. Still sold in stores for $90