The knee? Er... Let me tell you, unless you're only looking at ankle-length skirts, it's darned *hard* to find skirts that reach all the way to the knee. Which means I mostly only wear ankle-length skirts, but I digress. Mid-thigh is considered appropriate in school dress codes, and it's very likely the most common length manufactured. Even when I look at dresses labeled "longer lengths," their measurements tell me they'd end at least 6 inches above my knee, and I'm not a basketball player. So, unless you're saying we should all be wearing either ankle-length or sewing our own clothes...
Regarding cleavage, please take a look in the women's department at any store. Find a button-up shirt that actually buttons all the way up. 90% will button only to mid-bosom, perhaps with another button 8 inches up at the collar for the "one button undone" rule. Buttoning this button while not having any buttons in the interim would result in a big old keyhole on the chest, if the button will even reach the hole. These shirts are usually cut so that there isn't enough fabric there for the two sides to reach. They are angled out into a V shape. I looked in Target a few months ago. I found *one* style of shirt made to button all the way. It only came in colors like bright blue plaid and hot pink plaid.
The modes of dressing you are saying are required for men to control themselves are ones that involve having to make ones own clothing or only wearing vintage clothing from the 1950s. They simply are not widely available anymore.
Additionally, she pointed out what she was wearing and how she was behaving to emphasize that a hundred men managed to understand that wearing a short skirt and sitting on someone's lap is NOT consent to being kissed or fondled! Only the word "yes" is consent.
Oh, and by the way, I *do* wear long skirts. I *do* frequently wear high necklines (especially if I'm going to be somewhere as gender-imbalanced as a tech con). Generally, I'm about as covered as an Orthodox Jewish woman, even up to including frequently covering my hair . And you know what? I've still been assaulted and followed at technical conferences.
STOP blaming the victim! Changing how you dress DOES NOT change your likelihood of being assaulted.