For a raw squat, the feet should be set approximately hip-to-shoulder width apart. There are no hard and fast rules here, as everyone’s body (and therefore their squat) will be slightly different. A general rule, however, is that the wider your feet, the more toe flare you need...And if you’re super narrow, the feet are going to be toed out very slightly, if at all... The moderate stance width works incredibly well with a slight degree of toe flare.
Robertson Training Systems