Stealing is usually done sneakily too, iam. I don't question the sneakiness and the prurience of upskirting and downblousing. What I'm suggesting is that there are plenty of things women and girls can do to prevent most of it with regard to those two problems. Then there is the apparently increased sensitiveness to such sneaky and prurient behaviour that some people have already mentioned.
We are back to the argument of whether it is reasonable for women and girls (and men too for that matter) to expect to be able to wear whatever they like with no consequences at all. When sexuality is not involved nobody seems to think wearing "what you like" is automatically appropriate so it seems a bit weird to me to think that when boobs, which are sexualised objects whether we like it or not, and undercarriages ditto (also penises), are involved the sexual aspect should just be ignored or we should pretend it doesn't exist.
This is not to argue that men and boys should not behave properly. It is to argue that, realistically, 100% of them never will. 100% of women won't either.
The problem of upskirting was brought up about a news or discussion programme on TV recently. I forget who the woman was who complained. One of the cameras was pointed at the group at about waist level. Because the people being filmed were sitting on couches without a desk in front of them, a good deal of the thigh of a woman was visible in certain shots. She was wearing a short dress and was sitting with her legs crossed. She must have known that this would expose a good amount of thigh. It's not unreasonable, in my view, for people to assume that she doesn't mind showing a lot of thigh. Why else would she dress in a way that showed it? The tone of her complaint was that she was a victim of the cameraman's prurience. The cameraman was a woman and probably filming the woman (and the other participants) in exactly the same way as she films men.
The victimhood status that some women seem to revel in (c/f the increased sensitivity mentioned by others) in such situations seems to me to be like someone deciding to climb a mountain in totally unsuitable clothing and then complaining (they don't usually, but mountain rescue teams sometimes do, with some justification!) when they become victims of reality—the reality of mountain weather conditions. It's stupid behaviour parading as freedom to do what the hell I like that's the problem.