There are lots of correct and incorrect answers on this as no one width is the correct one for all things.
Narrow width allows maneuverability.
Medium width balances maneuverability with stability.
Wide width stability is the goal.
If you look at SL, GS and mogul skiers the width is Narrow (at the extreme side of narrow).
Good recreational skiers depending on what they are doing are between narrow and medium most of which depends on comfort level and application.
Beginners medium to wide, balance.
Speed skiers on the extreme side of wide for stable tracking hard to upset platform, but for aerodynamics try to get towards the narrowest possible without loosing stability.
So if you are suggesting to someone new to skiing the standing starting point is somewhere between shoulder width to a couple of inches apart (similar to standing stationary without skis). If it feels comfortable, it's probably is correct. THIS IS THE STARTING POINT. From there it varies to match the what the skier needs at the moment.
One important thing some of the images have extremely narrow width (high edge angles) but large ski separation (vertically) for body mechanics and clearance, don't confuse this with width (most mistakenly do).
If it look like an "A" frame its wrong and width, if it looks like high edge angle it narrow to the extreme and correct.
Narrow width allows maneuverability.
Medium width balances maneuverability with stability.
Wide width stability is the goal.
If you look at SL, GS and mogul skiers the width is Narrow (at the extreme side of narrow).
Good recreational skiers depending on what they are doing are between narrow and medium most of which depends on comfort level and application.
Beginners medium to wide, balance.
Speed skiers on the extreme side of wide for stable tracking hard to upset platform, but for aerodynamics try to get towards the narrowest possible without loosing stability.
So if you are suggesting to someone new to skiing the standing starting point is somewhere between shoulder width to a couple of inches apart (similar to standing stationary without skis). If it feels comfortable, it's probably is correct. THIS IS THE STARTING POINT. From there it varies to match the what the skier needs at the moment.
One important thing some of the images have extremely narrow width (high edge angles) but large ski separation (vertically) for body mechanics and clearance, don't confuse this with width (most mistakenly do).
If it look like an "A" frame its wrong and width, if it looks like high edge angle it narrow to the extreme and correct.