@goodie-bag @CoolOtamegane If you're talking about the underskort, don't think of it that way, think of it as a covering for panties that prevents the
actual panties from being seen. It's fine if people see the underskort because
that's what it's there for. It'll be made of thicker material than regular panties, also making it harder for a cameltoe to form. This doesn't mean guys won't keep trying to get a peek at them, as the tennis-club president in
Ueno-san wa Bukiyou can attest.
If you're talking about the show-off panties from page 2, that's quite simple: they're sexier panties that you don't mind the right person seeing. Think what a girl wears when she knows her boyfriend/girlfriend will get a look at them. Doesn't mean you'd want everyone to see them, but that they aren't panties you'd be embarrassed for even your bf/gf to see you in. (Like old ratty ones that have a couple of holes, but are really comfortable and/or all the rest are dirty so you had to wear them. Or the ones you wear during your period in case you have a leak, because you don't want your nice panties to get ruined.)