I played into non-translated version when it came out and I didn't find anything about them except for the pic in the menuWhat's the point of the different panties? They don't provide any stat bonus, nor are the changes visible in the different cut scenes. The only thing that changes is the upskirt pic in the menu, right?
Scenes don't change, endings don't, too, I reckon, if you collect them all/don't.
Also there was a pair of panties I couldn't get no matter what I did in the pub in the VIP zone where there's a harassment scene. Idk if it was unachievable or I was just dumb.