Modesty subroutine

From Memory Alpha, the free Star Trek reference

The modesty subroutine was added to Data's programming by his creator Doctor Noonien Soong during his "childhood". The subroutine was added in response to the objections of the colonists on Omicron Theta over having an anatomically correct android running around without any clothes on. Data did not feel it was necessary for him to wear clothing because he did not suffer from the elements. (TNG: "Inheritance")