So modesty and privacy is very important in terms of propriety and security.
Both are intimately connected.
Already as children, we learn not to show or talk about our "privates" to others.
And as adults, we understand that there are certain things about ourselves that we don't just talk about or divulge to others indiscriminately.
Not being discrete with these and showing either your private parts or your personal information can get you in a load of trouble by giving others the opportunity to take undue advantage of you.
Both open you up to be ridiculed or even raped of your person or information identity.
That which is yours to use with others in propriety is instead disclosed for taking out from your control and for use against you.
Security demands modesty of body and of information, and if not taken seriously, then no amount of lame covering will keep that which is private from public consumption. ;-)