I'm more befuddled by the women that wear low cut pants and not quite long enough blouses
Oh, and I got an explaination for that too.
When it isn't intentional it's usually a case of manufacture fault and people trying to fit clothes that don't fit.
See, a lot of womans tops are still cut for the old style of pants that rise to the waist. But then low cut jeans came into style which evolved into multiple rises for the waistband. Now, most companies have a varity of waistlines and most of the conservative companies have switched to "natural" waist, which is still lower then the old style.
Unfortunatly shirts have not quite caught up with the trend. Some companies do manufacture shirts designed longer, but a lot have not (and some have basic shirts that come in multiple lengths to match the jeans) so those shirts arn't long enough to cover up whats been exposed by the lowered pants line.
Second, shirt sizes generally don't take varied chest size into account. So, unless your bust matches your size or is smaller then your size, the front of your shirts ride up higher in the front. <-- this is my curse. It sucks.