Reading about this and comments about this elsewhere.
I'm 43. When I was a girl, it was a kicking and screaming fight to force me into a slip. It was hot, scratchy, and exceedingly uncomfortable as an extra layer. This has never changed. Once I got about 12 and was given free reign over my clothing choices, they went in the trash. Have never worn another ever again. They are still hot, scratchy, and an unnecessary layer. I'm a pure cotton gal. I don't care if it were antique silk. Not cotton = horribly uncomfortable. Was utterly surprised at an article with comments of women much younger than me who insisted upon wearing slips "just because", or because their granny said they'd be a tramp without one - literally. My mom won't go without one, because GASP, if the light hits you just the right way, you may be able to see the outline of her legs. So what's the big deal? People will know you have legs? Just not getting it. When I think of a slip, I see the granny from Beverly Hillbillies. Cannot imagine a modern woman insisting upon such an antiquated item.
Edit: For all of you so concerned about people seeing through your cheap clothing, start getting decent quality.