For example, where I live, nearly all people wear clothes, and they generally think that wearing clothes is important - even if the weather is mild enough that you won't get cold or sunburn if you dispensed with them. Moreover, they will get upset if other people dispense with theirs.
What I find funny is that people will ridicule organised religions for prescribing certain clothing (such as Mormonism, Sikhism, Islam), blissfully unaware of their own quasi-religious attitudes towards clothing.
And sometimes these attitudes can be quite extreme. There is a man in the UK who has been in prison for years for indecent exposure. Every time he is released from prison, he strips off outside, and they call the police to re-arrest him.