1) Go to the create a shirt tool
2) At step "2. STYLE" click on “+ more style options"
3) In the FRONT PLACKET STYLE section, select “Popover"
Size Tips & Caution
You won’t be able to unbutton this shirt all the way down, so any super-super-slim fits may create problems. Test if you can take off your existing shirts with just the collar and next two buttons undone. In general, consider widening your midsection width and shortening your shirt length just a bit for this more casual shirt style.