Much of marketing behavior is around making people feel shameful about everything; for example, shame in their feet? So they try to cover it up by buying some sort of Nike sneakers? Or for women… To purchase high heels or stuff which is positively bad for your physiology?
Also I have a theory about why people wear long pants, to hide their chicken legs?
Also, T-shirts and long sleeves… Maybe part of it is a modesty thing, but also part of it is that most people don’t have impressive arms?