The practical function of clothing is to protect the human carcass from dangers in the environment: weather (strong sunlight, extreme torridity or cold, and precipitation, for example), insects, noxious chemicals, weapons, and contact with abrasive substances, and other hazards. Clothing can protect against many things that might distress the naked human body. In some essentials clothing protects the environment from the clothing wearer as well (example: medical scrubs).
Some human cultures, such as the various peoples of the Arctic Circle, until recently made their clothing entirely of furs and skins, cutting clothing to fit and decorating http://www.twirlkids.com/ lavishly.