For men . . . via Nordstrom. Eco-friendly, tailored fit, classic single-button barrel cuffs, a pocket-protector-ready chest pocket, and a reasonable, yet quality-denoting price: $59.50. The shirt comes in four basic colors: white, pink, blue, and the pictured sage (which I think is great for date nights out). Find it here.
For a more casual look, possibly pair the shirt with Nordstrom's label's "Interlock" half-zip sweater, which boasts the standard mock collar and banded cuffs and hem, and is made from 100% cotton. $69.50; available in 4 colors (black, dark blue, grey, and red) here.