I used my corded, lightly boned stays with a wooden busk in front. The figure you get with these stays - even someone like me, a somewhat overweight mother of two - is one with a very high waist, bust pushed to the sides, and narrow ribcage. This was fashionable in the early 19th century, especially in the 1810's. The stays helps with posture, and prevents your outfit looking too much like maternity wear
Walking Dress for mourning, Ackerman's Repository, December 1817
With the bodice lining you get a decent lift and support, but of the mono bosom kind. It will pull the dress forward a bit if the bust is heavy. It will not help with posture, and won't hide any fluff you might have. This general look is seen in the very early 1800's (though I should think most women of fashion would wear some more substantial support), and might have remained among the lower classes for a bit longer, especially in places where stays were not common among ordinary women.
I myself would not wear the clothes of a middle- or upper class woman without some kind of proper stays under them. For some (Swedish) working class impressions though, using the bodice lining for support just might be adequate.