We are not doing something, we are omitting to put on clothing. Nakedness is perceived as a threat. Forcing another person to be naked is also deeply threatening. Most persons, if strip searched by police or airport officials without cause, will be so deeply upset they will attempt to take legal action against the officials involved. Stripping political prisoners is a common way of humiliating and subduing them, and in cold climates is often used as a form of torture.
Clothing is also deeply personal.
Artists, social reformers, and individualists of all kinds have found expression for their ideas and aspirations through dress. Sexual attraction and repulsion are also served by clothing. People who go to nudist colonies and beaches often are surprised to find that mass quantity public nakedness is anti-erotic. Actual bodily sex differences are less pronounced visually than gendered clothing differences. People often develop fetishes for items of clothing that they perceive as sexual and are more aroused by the fetish clothing than by the particular person in it.