In school students should be clean. Clothes shall not contain profane or other forms of offensive lettering, designs or advertising. Clothes or accessories shall not promote the use of drugs, alcohol, tobacco, marijuana, other illegal substances, death and destruction, or be oversized allowing objects to be concealed. Revealing or sexually suggestive clothing is not to be worn, and clothing must cover undergarments. Hats, sweatbands, bandannas, and sunglasses are not to be worn in the school buildings unless part of a school-sponsored activity approved by the principal.