I agree that younger girls seem to be lost on the point of being a little more modest, but please don't lump us all together. I make a point of looking professional at all times, and don't feel I need a slip to do so. Growing up my mother was a huge stickler about clothes: the fit, the look, if my undies showed, if it was see-through, etc. In fact, she introduced me to spanx fairly young, and still tisks me if my bra strap shows under a tank. (c'mon mom, I'm on vacation with a beer in my hand...)
If my skirt doesn't fit properly and "bunches up", or even hints at possibly exposing my underwear, I simply don't wear it. When I buy clothes for work I do all sorts of "tests" to make sure they're appropriate all around. I'm frugal and broke so if I'll be spending money on a skirt, it will not be sitting in my closet and deemed "unwearable" because it bunches. A slip is not something I grew up wearing, as the same for most women my age, so using them is a little foreign to us. We all kind of see spanx as "the new slip". (at least the ones that care about how they look) In fact I'm wearing a nice Ann Taylor pencil skirt right now, with NO slip, and since the waist of it hits me right at my pudgiest, I'm not wearing spanx either! I promise I'm not flashing any of my coworkers, although some would appreciate if I did more than others! Nor is my panty-line showing, and its not clinging.
My social mores are just fine, thankyouverymuch