Lining for knitted shirt?

I have started a knitted skirt for my wife based on a pattern in a 1950s Vogue Knitting magazine. Like all the other skirt patterns I have seen in magazines of this era there is no mention of a lining but my wife is concerned that without a lining it will cling. Are such skirts unlined because no lining is needed or perhaps for some other reason? For example, would women of that era have worn some kind of slip underneath? Not being a skirt wearer myself I have no experience of such matters!

In the 1950s women would definitely have worn a slip. Even so, skirts might or might not have been lined but were likely lined which would have helped support and hold the shape of the skirt. You could use any light, non-clingy fabric as a liner…